168 Uber and Lyft drivers suspended for offenses, including felonies, that should have barred them from employment: Officials

Scores of workers for Uber and Lyft were driving passengers around Portland, Oregon, despite having offenses ranging from traffic violations to criminal records that should have barred them from doing business as a ride-share driver, according to local authorities.

The Portland Department of Transportation confirmed to ABC News that they suspended or revoked the permits for 168 ride-share drivers in Portland since 2015, including two Lyft drivers who were convicted felons -- one convicted of sexual assault and the other for assault with intent to murder.

John Brady, the director of communications at the Portland Bureau of Transportation, said they uncovered these drivers after they started doing a system of "random checks."

"For 80 people a month, we do the full background check, we do criminal history and if the person is on the sex offender list," he told ABC News. They also do a series of random field checks using "secret shoppers and uniformed personnel" who check the safety of the vehicles and more.

"We want these consumers to be safe, in terms of physical safety and the mechanical safety of the cars as well as the drivers, so we would like Uber and Lyft to do everything that they can to make sure that that takes place," Brady said. "We’re still going to continue to do our own checks, we found it a good backup system to enhance consumer protections."

While two of the 168 drivers were felons, "you can be disqualified for driving for a number of things, if you haven’t had a driver's license continuously for the past year, if you have had a certain number of traffic violations, if you have been involved in any traffic crime, if you don't have a valid license, it runs the gamut," Brady added.

"We have tens of thousands of taxi, Uber and Lyft drivers and by and large, they are safe drivers and safe individuals but we’re committed to finding anyone who isn't and make sure that they aren’t driving," Brady said.

A spokesperson for Uber told ABC News, "There's nothing more important than the safety of the drivers and riders we serve. We have strengthened our background checks and introduced new screening technology that monitors new criminal offenses. But safety does not start and end with a background check."

"Uber has a number of safety features in place for riders and drivers, including an emergency button with 911 integration technology in more than 250 cities across the US, including Portland. We will continue to put safety at the heart of our business,” the statement added.

Lyft told ABC News that "safety is fundamental" to them and "since the beginning we have built products and policies with that in mind."

The statement continued: "All those who apply to drive with Lyft are screened for criminal offenses and driving incidents. Lyft was the first rideshare company to institute criminal background checks. Just this summer we announced an expansion of our criminal background check process to include continuous monitoring, as well as a new enhanced identity verification process. Any driver who does not pass the initial, annual, and continuous screenings is not able to use our platform. We are constantly working to improve the safety of our platform and are committed to delivering the best experience for all users."