An international team of cave explorers has shown that cave walls and the prehistoric rock art that adorns them can preserve human DNA for thousands of years.
The 1991 murder of four teenage girls in a Texas yogurt shop remains unsolved, but there's hope that advancing DNA technology will change that.
Contamination and other errors in DNA analysis have occurred at the Washington State Patrol crime labs, most of it the result of sloppy work. The most common problems are cross-contamination by ...
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