The lab was shut after revelations surfaced that examiners were producing inaccurate measurements in some drug cases.
District Attorney Kathleen Rice's office has sent letters to local and state inmates jailed in Nassau County for drug or drunken-driving convictions. The letter includes contact information for lawyers.
Rice plans to have evidence in as many as 3,000 cases retested, going back several years.
Earlier this month, a judge ordered a retrial in a drunken driving case because of questions about the crime lab.