Authorities say a chemist at a second Massachusetts crime lab is accused of tampering with drug evidence.
State Attorney General Martha Coakley said Sunday that 35-year-old Sonja Farak of Northampton, who works at a lab in Amherst in western Massachusetts, was arrested Saturday. Officials say she removed a substance from a case file that tested positive for cocaine and replaced it with one that did not test positive. She's also charged with possession.
Coakley says the lab contacted state police Friday to report a discrepancy in inventory.
Last year, a chemist at a Boston lab was accused of faking test results, putting thousands of criminal cases into question. She was indicted last month.
Farak does not have a listed phone number and it's not clear whether she has a lawyer.