Two Uber drivers were arrested in separate incidents over the weekend.
Another driver in Chicago was pulled over for not wearing a seat belt and was arrested when officers discovered marijuana and a loaded weapon in the car. Police learned the man does not have the proper license for carrying a firearm and has prior felony convictions.
Uber does not allow drivers or passengers to have firearms even with proper licensing.
The company confirmed the drivers involved in both incidents have been banned from the ride sharing service.
Uber has exploded around the world, but its ambitions have hit a number of speed bumps. The company has been slapped with government fines, sued by drivers, targeted in protests, and even banned outright in some cities. In India, an Uber driver was found guilty of raping a passenger.
Voters in Austin, Texas, passed a law that mandated fingerprinting for ride share drivers in May. Uber and competitor Lyft promptly left the city in protest. Critics argue that fingerprints are more thorough than the name-based checks that Uber currently conducts.
Uber, meanwhile, says fingerprinting is discriminatory, time consuming and is not necessarily more effective at weeding out potentially dangerous drivers.
The company said the Chicago man's felony convictions, which were weapons-related and occurred in 1995 and 2003, would not have prevented him from clearing a background check for a city taxi license either. Per a Chicago ordinance, licenses are only denied if the felony occurred within the past five years. Uber's policy bans drivers with felonies less than seven years old.
Uber, which is valued at $62.5 billion, has faced multiple lawsuits for advertising its service as the "safest ride on the road." Uber stopped making those types of claims earlier this year and has agreed to pay more than $50 million to settle the suits.