In this Saturday, Aug. 5, 2017, file photo, Sgt. Rich Adams demonstrates a field test for marijuana at the Susquehanna Township Police Department in Harrisburg, Pa. In 2017, fearing accidental overdoses from fentanyl, police officers across Pennsylvania's Dauphin County ended a longstanding practice of using field test kits on suspected drugs, instead sending suspected drugs straight to the Pennsylvania State Police lab for testing. (Christine Vendel/PennLive.com via AP) ** FILE **
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