ready, let's get to work. >>> for 12 years, roy brown sat in prison for sabena's murder. failing to get a new trial, brown contacted the innocence project in new york asking them for help. >> the project was founded a little over 15 years ago to help convicted prisoners use what was then a new technology, dna technology to prove that they were wrongly convicted of the crimes for which they were in prison. >> they accepted his case. while doing some research, the innocence project learned that before brown's trial, prosecutors contacted a doctor, a well-known owe don't toll gist. >> i have one note that if what i was looking for was in fact an upper, i would exclude mr. brown. >> so the innocence project petitioned the court for permission to test the victim's ready to shirt found at the crime scene, thinking it might contain saliva. >> it's not impossible to find dna after a 15 year case, but it makes it a little bit more difficult. >> analyst tim goebel examined the shirt with an alternate light source. saliva and other biological materials will flores when hit with this