New York —

At the heart of the case against the man accused of the Gilgo Beach killings is DNA evidence — but the novel way that evidence was tested may now determine whether prosecutors can use it against their prime suspect, Long Island architect and family man Rex Heuermann.

A Suffolk County judge is set to decide Wednesday whether the results of that testing method, which has never been used in a New York courtroom, should be permitted in Heuermann’s trial, which could start next year.

Heuermann is charged with murder in the deaths of at least seven women spanning three decades. He has pleaded not guilty.

In arguments before the judge earlier this year, prosectors argued the technology they used in the Gilgo case – known as whole genome sequencing – bolsters testing that’s

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