Over 100 Uber drivers have been accused of sexually assaulting or abusing customers in the U.S. over the last four years, CNN reported Tuesday.

The news outlet examined cases from 20 major cities, using police reports, federal court records and county court databases, and found that 103 Uber drivers had been accused of sexually assaulting or abusing passengers.

The accused Uber drivers had either been arrested, were wanted by police or were named in civil suits related to the incidents. At least 31 of those drivers have been convicted for crimes ranging from false imprisonment to rape, CNN reported.

In several cases, CNN found that accused Uber drivers appeared to prey on intoxicated women. In one such instance, a woman told CNN that an Uber driver had raped her in San Diego, California. She said shed been drinking and passed out on the ride home, and woke up to find the driver on top of her in the back seat of the car.

In another case, a woman in Miami said an Uber driver had sexually assaulted her while she was intoxicated. She alleged the driver had carried her up to her apartment and raped her after she passed out on the drive home.

You are pretty much hitchhiking with strangers, the woman, who was not identified, told CNN. How many people is it going to take to get assaulted before something is done?