Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

rduncan16

help me plzzz

  • one year ago
  • one year ago

  • This Question is Closed
  1. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    Review Questions What are club drugs? What are some of the factors that support the use of club drugs? What are screening tests? Why are they used? What are color tests? Why are these tests used? What are microcrystalline tests? What information do they provide? What is spectrophotometry? How can this be useful in identifying drugs? Critical Thinking Questions Why are forensic scientists an important part of drug cases? If you were a forensic scientist and you were called to a crime scene to see if drugs were present, what would you do to determine this? Why is it important for forensic scientists to have as much information as possible about the place where a possible drug substance was found? What are some of the difficulties in identifying particular drugs? Why is it important for forensic scientists to be able to identify particular drugs?

    • one year ago
  2. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    wow that's alot of questions

    • one year ago
  3. JazzyPoowh
    Best Response
    You've already chosen the best response.
    Medals 0

    ikr but imma help..gve me a sec

    • one year ago
  4. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    lol ikr but thats only like 1/12 of them

    • one year ago
  5. JazzyPoowh
    Best Response
    You've already chosen the best response.
    Medals 0

    Club drugs are illegal drugs that are often, although not exclusively, used at dance clubs, raves and circuit parties. Drugs often referred to as club drugs include: MDMA (ecstasy), methamphetamine (crystal meth, speed), GHB (liquid X), Ketamine (special K) and less often, Viagra and amyl nitrites (poppers). These drugs also are often used outside of clubs and parties.

    • one year ago
  6. JazzyPoowh
    Best Response
    You've already chosen the best response.
    Medals 0

    i answered the first one

    • one year ago
  7. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    Screening tests are laboratory tests that help to identify people with increased risk for a condition or disease before they have symptoms or even realize they may be at risk so that preventive measures can be taken. They are an important part of preventive health care. Screening tests help detect disease in its earliest and most treatable stages. Therefore, they are most valuable when they are used to screen for diseases that are both serious and treatable, so that there is a benefit to detecting the disease before symptoms begin. This is what i think the answer for the first one is

    • one year ago
  8. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    are these in urown words they need to be in ur own words

    • one year ago
  9. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    nope but you can reword this and make it into your on words

    • one year ago
  10. JazzyPoowh
    Best Response
    You've already chosen the best response.
    Medals 0

    they need to be in yhur own words.. what i would say is club drugs are drugs that many ones who go to parties or clubs use to so cal''have a good time'' when in reality they are just killing themselves. these drugs just like others damage the brain cells and cause serious heart failure... those are my words

    • one year ago
  11. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    Yea but he can take what i sent to him and make it into his on words

    • one year ago
  12. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    ok can u continue and help with the other ones as well and mabie try to put it in ur own words if not thats ok just tell me if it is or not

    • one year ago
  13. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    .......

    • one year ago
  14. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    r u gonna help me ugggggg

    • one year ago
  15. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    omg plzz help

    • one year ago
  16. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    yes i will help you

    • one year ago
  17. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    Drug detection in the forensic context requires numerous analytical techniques. Depending on locally adopted standard procedures, different techniques are used for screening solid samples for potential illicit substances (e.g. Fourier transform infrared spectroscopy (FTIR)). A sample suspected of containing prohibited material passes through another layer of techniques to confirm that the illegal substance is present and to identify it (e.g. liquid/gas chromatography). Finally, the drug is systematically quantified (e.g. mass spectrometry). Microcrystalline tests fall within the second step of this analytical process. They are low cost because of the minute amount of reagents used and the simplicity of the instrumentation and consumables required to perform the analysis. They offer all the features required by a good confirmation technique while being very fast to administer and interpret, although they do not offer quantification capabilities. Microcrystalline tests are chemical tests resulting in the formation of unique microcrystals for a given substance when combined with a specific reagent. Microcrystals are observed under a microscope and micrographs or microvideos constitute the results of the test. Thanks to the chemical mechanism by which microcrystals develop, microcrystalline tests can be applied to molecules of various sizes, shapes, charges, and with different functional groups, and can naturally distinguish between enantiomers. not in my on words BTW this is for the 2nd question

    • one year ago
  18. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    ok 3. What are color tests? Why are these tests used?

    • one year ago
  19. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    i can't figure out that one

    • one year ago
  20. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    5. What is spectrophotometry? How can this be useful in identifying drugs?

    • one year ago
  21. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    ... will u plzzz help answer ^ question

    • one year ago
  22. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    The near infrared range (NIR) of the electromagnetic spectrum extends from 800 to 2500 nm, being confined between the middle IR and visible spectral regions. The method of NIR spectroscopy is based on a combination of spectrophotometry and statistical methods of multifactor analysis, which provides excellent possibilities for drug identification and quality control even without opening the package. We have studied a series of drugs including cefazolin sodium and generic drugs based on enalapril maleate. True and falsified variants of a given drug X were classified into groups according to “drug name,” “drug manufacturer,” and “falsified product” by means of NIR spectroscopic analyses performed using the NIR Fourier-transform instruments Multi Purpose Analyzer (Bruker, Germany) and Antaris (Thermo Electron Corporation, USA). The potential of this method for the identification of drugs without violation of their packing shows good prospects for introducing it into the drug quality control system. This method should be recommended for introduction into the future Russian State Pharmacopoeia as a general method of drug analysis.

    • one year ago
  23. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    there's what i think the answer is but remember what i told you to read it and then put it in ur on words

    • one year ago
  24. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    1. Why are forensic scientists an important part of drug cases?

    • one year ago
  25. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    ......help me can u also put the answer in ur own words

    • one year ago
  26. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    Forensic science is a term used to describe the actions taken by investigators in multidisciplinary fields for the examination of crime scenes and gathering of evidence to be used in prosecution of offenders in a court of law. The main use of forensic science is for purposes of law enforcement to investigate crimes such as murder, theft, or fraud. Forensic scientists are also involved in investigating accidents such as train or plane crashes to establish if they were accidental or a result of foul play. The techniques developed by forensic science are also used by the U.S. military to analyze the possibility of the presence of chemical weapons or high explosives, to test for propellant stabilizers, or to monitor compliance with international agreements regarding weapons of mass destruction. The main areas used in forensic science are biology, chemistry, and medicine, although the science also includes the use of physics, computer science, geology, or psychology. Forensic scientists examine objects, substances (including blood or drug samples), chemicals (paints, explosives, toxins), tissue traces (hair, skin), or impressions (fingerprints or tidemarks) left at the crime scene. The majority of forensic scientists specialize in one area of science. The analysis of the scene of a crime or accident involves obtaining a permanent record of the scene (forensic photography) and collection of evidence for further examination and comparison. Collected samples include biological (tissue samples such as skin, blood, semen, or hair), physical (fingerprints, shells, fragments of instruments or equipment, fibers, recorded voice messages, or computer discs) and chemical (samples of paint, cosmetics, solvents, or soil). Most commonly, the evidence collected at the scene is subsequently processed in a forensic laboratory by scientists specializing in a particular area. Scientists identify, for example, fingerprints, chemical residues, fibers, hair, or DNA. However, miniaturization of equipment and the ability to perform most forensic analysis at the scene of crime results in more specialists being present in the field. Presence of more people at the scene of crime introduces a greater likelihood of introduction of contamination into the evidence. Moreover, multi-handling of a piece of evidence (for example, a murder weapon) is also likely to introduce traces of tissue or DNA not originating from the scene of a crime. Consequently, strict quality controls are imposed on collection, handling, and analysis of evidence to avoid contamination. The ability to properly collect and process forensic samples can affect the ability of the prosecution to prove their case during a trial. The presence of chemical traces or DNA on a piece of debris is also crucial in establishing the chain of events leading to a crime or accident. Biological traces are collected not only from the crime scene and deceased person, but also from surviving victims and suspects. Most commonly, samples obtained are blood, hair, and semen. DNA can be extracted from any of these samples and used for comparative analysis. DNA is the main method of identifying people. Victims of crashes or fires are often unrecognizable, but if adequate DNA can be isolated a person can be positively identified if a sample of their DNA or their family's DNA is taken for comparison. Such methods are being used in the identification of the remains in Yugoslav war victims, the World Trade Center terrorist attack victims, and the 2002 Bali bombing victims. Biological traces, investigated by forensic scientists come from bloodstains, saliva samples (from cigarette butts or chewing gum) and tissue samples, such as skin, nails, or hair. Samples are processed to isolate the DNA and establish the origin of the samples. Samples must first be identified as human, animal, or plant before further investigation proceeds. For some applications, such as customs and quarantine, traces of animal and plant tissue have to be identified to the level of the species, as transport of some species is prohibited. A presence of a particular species can also prove that a suspect or victim visited a particular area. In cases of national security, samples are tested for the presence of pathogens and toxins, and the latter are also analyzed chemically. A growing area of forensic analysis is monitoring non-proliferation of weapons of mass destruction, analysis of possible terrorist attacks, or breaches of security. The nature of samples analyzed is wide, but slightly different from a criminal investigation. In addition to the already-described samples, forensic scientists who gather evidence of weapons of mass destruction collect swabs from objects, water, and plant material to test for the presence of radioactive isotopes, toxins, or poisons, as well as chemicals that can be used in production of chemical weapons. The main difference from the more common forensic investigation is the amount of chemicals present in a sample. Samples taken from the scene of suspected chemical or biological weapons often contain minute amounts of chemicals and require very sensitive and accurate instruments for analysis. Forensic chemistry performs qualitative and quantitative analysis of chemicals found on people, various objects, or in solutions. The chemical analysis is the most varied from all the forensic disciplines. Chemists analyze drugs as well as paints, remnants of explosives, fire debris, gunshot residues, fibers, and soil samples. They can also test for a presence of radioactive substances (nuclear weapons), toxic chemicals (chemical weapons), and biological toxins (biological weapons). Forensic chemists can also be called on in a case of environmental pollution to test the compounds and trace their origin. The identification of fire accelerants such as kerosene or gasoline is of great importance for determining the cause of a fire. Debris collected from a fire must be packed in tight, secure containers, as the compounds to be analyzed are often volatile. An improper transport of such debris would result in no detection of important traces. One of the methods used for this analysis involves the use of charcoal strips. The chemicals from the debris are absorbed onto the strip and subsequently dissolved in a solvent before analysis. This analysis allows scientists to determine the hydrocarbon content of the samples and identify the type of fire accelerator used. Physical evidence usually refers to objects found at the scene of a crime. Physical evidence may include all sorts of prints such as fingerprints, footprints, handprints, tidemarks, cut marks, tool marks, etc. Analysis of some physical evidence is conducted by making impressions in plaster, taking images of marks, or lifting the fingerprints from objects encountered. These serve later as a comparison to identify, for example, a vehicle that was parked at the scene, a person that was present, a type of manufacturing method used to create a tool, or a method used to break in a building or harm a victim. An examination of documents found at the scene or related to the crime is often an integral part of forensic analysis. Such examination is often able to establish not only the author but, more importantly, identify any alterations that have taken place. Specialists are also able to recover text from documents damaged by accident or on purpose. The identification of people can be performed by fingerprint analysis or DNA analysis. When none of these methods is viable, facial reconstruction can be used instead to generate a person's image. Television and newspapers then circulate the image for identification. Pathologists and forensic anthropologists play a very important part in forensic examination. They are able to determine the cause of death by examining marks on the bone(s), skin (gunshot wounds), and other body surfaces for external trauma. They can also determine a cause of death by toxicological analysis of blood and tissues. A number of analytical methods are used by forensic laboratories to analyze evidence from a crime scene. Methods vary, depending on the type of evidence analyzed and information extracted from the traces found. If a type of evidence is encountered for the first time, a new method is developed. Biological samples are most commonly analyzed by polymerase chain reaction (PCR). The results of PCR are then visualized by gel electrophoresis. Forensic scientists tracing the source of a biological attack could use the new hybridization or PCR-based methods of DNA analysis. Biological and chemical analysis of samples can identify toxins found. Imaging used by forensic scientists can be as simple as a light microscope, or can involve an electron microscope, absorption in ultraviolet to visible range, color analysis, or fluorescence analysis. Image analysis is used not only in cases of biological samples, but also for analysis of paints, fibers, hair, gunshot residue, or other chemicals. Image analysis is often essential for an interpretation of physical evidence. Specialists often enhance photographs to visualize small details essential in forensic analysis. Image analysis is also used to identify details from surveillance cameras. The examination of chemical traces often requires very sensitive chromatographic techniques or mass spectrometric analysis. The four major types of chromatographic methods used are: thin layer chromatography (TLC) to separate inks and other chemicals; atomic absorption chromatography for analysis of heavy metals; gas chromatography (GC); and liquid chromatography (HPLC). GC is most widely used in identification of explosives, accelerators, propellants, and drugs or chemicals involved in chemical weapon production, while liquid chromatography (HPLC) is used for detection of minute amounts of compounds in complex mixtures. These methods rely on separation of the molecules based on their ability to travel in a solvent (TLC) or to adhere to adsorbent filling the chromatography column. By collecting all of the fractions and comparing the observed pattern to standards, scientists are able to identify the composition of even the most complex mixtures. New laboratory instruments are able to identify nearly every element present in a sample. Because the composition of alloys used in production of steel instruments, wires, or bullet casings is different between various producers, it is possible to identify a source of the product. In some cases chromatography alone is not an adequate method for identification. It is then combined with another method to separate the compounds even further and results in greater sensitivity. One such method is mass spectrometry (MS). A mass spectrometer uses high voltage to produce charged ions. Gaseous ions or isotopes are then separated in a magnetic field according to their masses. A combined GC-MS instrument has a very high sensitivity and can analyze samples present at concentrations of one part-per-billion. As some samples are difficult to analyze with MS alone, a laser vaporization method (imaging laser-ablation mass spectroscopy) was developed to produce small amounts of chemicals from solid materials (fabrics, hair, fibers, soil, glass) for MS analysis. Such analysis can examine hair samples for presence of drugs or chemicals. Due to its high sensitivity, the method is of particular use in monitoring areas and people suspected of production of chemical, biological, or nuclear weapons, or narcotics producers. While charcoal sticks are still in use for fire investigations, a new technology of solid-phase microextraction (SPME) was developed to collect even more chemicals and does not require any solvent for further analysis. The method relies on the use of sticks similar to charcoal, but coated with various polymers for collecting different chemicals (chemical warfare agents, explosives, or drugs). Collected samples are analyzed immediately in the field by GC. SEE ALSO Computer forensics; Crime scene investigation; DNA; DNA recognition instruments; Document forgery; Gas chromatograph-mass spectrometer; Isotopic analysis; Thin layer chromatography. I know it's alot but you need to read it

    • one year ago
  27. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    i read it but its not what im looking for im looking for an answer on y u think its important and i need it in ur own words

    • one year ago
  28. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    what's the question

    • one year ago
  29. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    1. Why are forensic scientists an important part of drug cases?

    • one year ago
  30. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    it needs to eb in ur own words and y u think it

    • one year ago
  31. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    because forensic scientists investigate more in drug cases then any other case or lab, and also because they have all the establish facts of interest in relation to criminal or civil law

    • one year ago
  32. rduncan16
    Best Response
    You've already chosen the best response.
    Medals 0

    2. If you were a forensic scientist and you were called to a crime scene to see if drugs were present, what would you do to determine this?

    • one year ago
  33. Tiffany2012
    Best Response
    You've already chosen the best response.
    Medals 1

    I would probably ask question's and then do a anaylasis

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.