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Like a photograph on photograph paper. >> the ninhydrin revealed that dorothy wasn't perspiring excessively when she wrote the notes, something that usually occurs when someone intends to end their own life. >> and told him that they needed to take another look at this case because there was something wrong. >> but perhaps the most definitive proof would come from the envelope flaps. who had licked them, dorothy or chris? s in the nation, what's precious to you

Stamps or envelope flaps, you're going to jail. >> the cost of the dna testing, approximately $7,000, would have to be paid by paula nawrocki. blood samples from both paula and her husband were sent to a local dna lab along with the threatening letters and the envelopes. >> the amount of dna that winds up on the back of a stamp or an envelope flap depends on how hard you lick the envelope, how much cells that you shed from the inside of your mouth. there are variables that's hard to predict exactly what the value would be. but it is there. in some cases there is more dna than others. >> first ...

Admitted that paula's situation did not look good. >> my first thought was she's probably guilty. it just looked overwhelming when you looked at the whole complaint. >> the fbi found some partial fingerprints on the threatening letters, but they did not match paula nawrocki's. the defense team wanted to see if any dna was present on the threatening letters. the prosecutor would allow dna testing by the defense only if the results were fully disclosed, regardless of the outcome. paula's defense team wanted to make sure she understood the ramifications of the agreement. >> he asked would there b...

Notes. something that usually occurs when someone intends to end their own life. >> and told him, that they needed to take another look at this case. because there was something wrong. >> but perhaps the most definitive proof would come from the envelope flaps. who had licked them? dorothy or chris? ♪ ♪

Ninhydrin, a chemical that acts with the amino acid in perspiration. >> we placed those letters and envelopes into a humidifying chamber. under the conditions, the prints will develop like a photograph on photograph paper. >> it revealed that dorothy was not sweating when she wrote the notes. something that usually occurs when someone intends to end their own life. >> and told him, that they needed to take another look at this case. because there was something wrong. >> but perhaps the most definitive proof would come from the envelope flaps. who had licked them? dorothy or chris?