A bag of white stuff. A cigar box wrapped tightly in duct tape. A bottle of pills labeled as a prescription amphetamine.

Drivers for Uber’s courier service don’t always know what’s inside the suspicious-looking packages that people ask them to deliver — but some know they don’t want to be a part of it.

NBC News spoke to six drivers from around the U.S. and Australia who said they are worried they’re being used as unwitting “drug mules,” ferrying across town what they believe may be narcotics while doing work for Uber Connect, a courier service the tech company started early in the coronavirus pandemic.