BOSTON (AP) — The chemist at the center of a scandal that shut down a state crime lab was involved in testing more than 50,000 drug samples, raising the possibility of an enormous number of legal challenges from people convicted or awaiting trial.

Lists of drug samples handled by the chemist since 2003 were turned over to public defenders and prosecutors Tuesday, five days after state police shut down the lab. Anne Goldbach, forensic services director for the state’s public defender agency, said the lists of more than 50,000 samples show which cases the chemist handled during her nine-year tenure at the lab.

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