Question

When a small amount of DNA is found in human saliva on a glass at a crime scene, how do forensic scientists analyze the saliva to find a suspect?

Answer 1

Well the DNA is specific and unique to every person, there are specific DNA sequences also called as variable no of tandem repeats which u obtain from your parents and which they have obtained from their parents. so these sequences are specific to u and your family only. this is how they actually identify a person..

Answer 2

I found the answer, and actually they use a test, PCR, that copies small strips of DNA into millions of copies. So thank you for your effort.