Running labs test on personal items retrieved from crime scenes. None of these can indicate time of occurrence. Obviously will be used to influence confessions and plea deals. The only true biological “identifier” would be DNA.

https://www.nij.gov/topics/forensics/evidence/trace/Pages/forensic-identification-using-individual-chemical-signatures.aspx

No high tech crime lab analysis will be able to prevent wrongful convictions if the cops suppress and crime labs fail to perform due diligence testing.

http://www.tulsaworld.com/news/courts/exonerated-man-sues-city-of-tulsa-former-detectives-after-serving/article_0f45988a-a840-5389-a84d-4fd0e3c68ff9.html

New Chicago State Attorney’s office case integrity unit gets innocent man jailed by mis-identification out after two months incarceration.

http://www.chicagotribune.com/news/local/breaking/ct-chicago-wrongful-arrest-patrick-met-20170708-story.html