What is a major potential problem with DNA evidence?
Having too much DNA
Contamination from other sources
Having to heat up DNA to keep it from degrading
Having too many matches to DNA typing
Stacey Warren - Expert brainly.com
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okay imagine that you are at a crime scene, you are looking for dna evidence, you can either find it from a hair/blood etc which will give dna in very small amount , so first is wrong
everyone has different dna so their cannot be too many matches, so last is wrong
heating up will instead degrade the dna , so third is wrong
at a crime scene , many people could be involved , and because of this there could be dna from many people , hence causing contamination, so second is corect