Cops say they're being poisoned by fentanyl. Experts say the risk is 'extremely low'

Critics say U.S. government training videos like this one from the Centers for Disease Control and Prevention exaggerate fears of fentanyl exposure among police. (Centers for Disease Control and Prevention)

Last December, Officer Courtney Bannick was on the job for the Tavares, Fla., police department when she came into contact with a powder she believed was street fentanyl.

The footage from another officer's body camera shows Bannick appearing to lose consciousness before being lowered to the ground by other cops.