Nassau County District Attorney Kathleen Rice says she will ask court approval to appoint Eric Dinallo to lead an investigation. Dinallo is the former state insurance superintendent.
The lab was closed last week. Authorities said they'd learned that police supervisors may have been aware since September that errors were occurring with the analysis of drug evidence.
The findings could lead to exoneration or a reduction in charges for some people convicted of drug offenses.
The lab was placed on probation by a national accrediting agency in December.