A Huntsville Police Department officer was exposed to fentanyl while processing, testing and weighing evidence on Thursday night.
The department said it happened about 9 p.m.
The officer was transported to Huntsville Hospital for precautionary reasons.
He is doing well, according to police.
Fentanyl is a dangerous opioid pain killer and analgesic with a heroin-like impact.
The drug has been cited in many overdoses and deaths.