A Manhattan judge yesterday declined to dismiss a crack-dealing case in which one-quarter of the evidence inexplicably went missing under the care of a disgraced NYPD lab technician.

But the judge allowed the defense lawyer to raise the issue of the drugs lost by under-investigation tech Mariem Megalla with jurors when the case of accused Harlem dealer Kasien Adderley goes to trial tomorrow.

Cops had vouchered eight rocks of crack, allegedly tossed to the sidewalk by Adderley’s co-defendant when he was busted outside his West 111th Street apartment building in February 2009.

But more than 200mg, the equivalent of two of the eight rocks, was missing when the evidence was retested as part of the NYPD’s Megalla Corrective Action, according to internal police documents.