48 Hours for DNA

Today's New York Times reports that
DNA matching that of two escaped killers was found in a cabin in the remote resort of Mountain View, N.Y., 15 heavily wooded miles west of the state prison in Dannemora, an official briefed on the investigation said on Monday morning.

The forensic evidence indicated that the men had been there within the last 48 hours, according to the official, who was not authorized to discuss the search and spoke on the condition of anonymity.

A pair of prison-issued underwear was also found in the cabin, the official said.
Andy Newman & William K. Rashbaum, DNA of Escaped Convicts Found in Cabin, Official Says, N.Y. Times, June 22, 2015 

It would interesting to know what "forensic evidence indicated that the men had been there within the last 48 hours." DNA itself carries no known signs of how long it has sat on some surface. If the DNA were in saliva on, say, an apple core left from a snack, would the extent of oxidation of the food allow it to be dated within a 48-hour period? Seventeen days have elapsed since the two men escaped.

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