Massachusetts chemist accused of tampering with evidence , drug possession . Sonja Farak removed heroin , cocaine from evidence inventory , attorney , alleges . Brad Puffer , spokesman for the attorney general 's office , told CNN that the substances under investigation were heroin and cocaine . Another chemist was accused of tampering , affecting 34,000 drug users , in Massachusetts .
Massachusetts chemist accused of tampering with evidence , drug possession . Sonja Farak removed heroin , cocaine from evidence inventory , attorney , alleges . Another chemist was accused of tampering , affecting 34,000 drug users , in Massachusetts .