DNA on half-eaten food may become incriminating evidence

A bite mark on a homicide victim’s skin is not an unusual discovery…With luck, a good match might help prove a suspect’s presence at the scene of the crime, but it’s often a stretch.

During biting, however, something more than bite marks is left behind that also can link a suspect to a crime: saliva. Floating in saliva are skin cells from the cheek interior and white blood cells (leukocytes); each cell contains an individual’s unique DNA.


In a new study…[Sara] Zapico and co-author Sofia T. Menéndez…show that it is quite possible to recover and isolate DNA from saliva on bitten foods, even some 15 hours after the saliva has dried.

“Quantity and purity of DNA often depends on food type,” Zapico explains. Few previous studies have shown great success in isolating human DNA from foods displaying bite marks.

According to Zapico and Menéndez, their new work is clear proof that should a bite mark at a crime scene warrant an attempt to match the impression….


The GLP aggregated and excerpted this blog/article to reflect the diversity of news, opinion and analysis. Read full, original post: Crime Bite: DNA on Half-Eaten Food May Someday Send Crooks to Jail

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