Look at this scenario:
Girl accuses boy of sexual contact. Boy pleads innocent. Girl has rape kit done, with inconclusive results. Nothing on her body to prove the offense happened. Then DNA in her underwear shows a match to boy. How did that get thee without any on or in her body? Detective said she was full of semen, however did not match boy. Could it have been picked up by her underwear touching boys toilet bowl when using the restroom? Strange to me there wasn’t anything on her body yet shows in underwear. Other possibility is the DNA was planted there by cops. Do the forensic experts identify the source of DNA ie: urine, semen, saliva etc?
If a knife is seized from a crime scene that has been used to stab someone,if forensic testing is done can it come out blank?taking into consideration that’s the knife used.and can comparing dna from offender and knife used be tested and get results in 5 hours ?