The inability to age DNA evidence is a limitation to these cold cases. No mention of how the police got the school teacher’s defendant’s DNA.

Charles Wright, 56, of Hawthorne, was arrested Thursday on a murder charge in the slaying of Pertina Epps, 21, who was found dead beneath a carport in Gardena on April 26, 2005.
— Read on nypost.com/2022/01/31/dna-links-california-teacher-charles-wright-to-cold-case-murder/