MINEOLA - Thousands of samples taken by the narcotics section of Nassau County's troubled crime lab will have to be retested after it has been revealed that technicians incorrectly recorded the purity and weight of drugs.

Nassau County District Attorney Kathleen Rice has announced she's ordering the retesting of as many as 5,000 samples from drug cases that her office prosecuted between 2007 and 2009.

"In order for this county to have the state-of-the-art lab that they deserve, we need to go back and see what was done in the past, and make sure that that does not happen again," Rice said.

Back in December, the Nassau County crime lab was placed on probation for failing to follow national standards. Last week, the lab's narcotics section was shut down for making serious errors in a half-dozen drug cases.

Rice said she is not sure how long the retesting process will take or how much money it will cost.