Fentanyl worries changing way narcotics officers operate

ST. LOUIS (AP) — The street version of fentanyl blamed in the deaths of thousands of Americans is also threatening police officers, forcing changes in long-standing basics of drug investigations, from confiscations to testing and undercover operations, law enforcement officials say.
Overdose deaths have surged as drugs such as heroin, cocaine and counterfeit prescription pills are now commonly laced with fentanyl to increase potency, though drug investigators say it is increasingly sold by