Paul Caneiro’s defense team is challenging a DNA tool known as STRmix, which prosecutors say has been tested and tried across the U.S.

The explosive trial of a New Jersey man accused of slaughtering four of his relatives at their mansion six years ago is expected to feature previously unusable DNA samples as evidence, according to a report Friday.

Lawyers for Paul Caneiro who is charged with the brutal murders of four of his relatives are challenging the use of an increasingly common tool in DNA analysis.