China has placed a ban on unqualified and unlawful drivers working for car-hailing apps, including ex-convicts who served time for drug-related crimes, robbery and serious traffic violations, China News Service (CNS) reported.

Fugitives, as well as those who have committed crimes that jeopardized national security or restricted others’ personal freedoms, would also be forbidden from registering as drivers for the apps.

The blacklist was issued on Monday by the Internet Society of China together with Didi Chuxing, a Chinese car-hailing app industry giant. Didi Chuxing is also considering increased restrictions on drivers who have mental illnesses and those with more minor traffic violations, CNS reported.

Traffic authorities in Shenzhen have met with representatives from several car-hailing app companies to discuss the feasibility of barring more high-risk drivers from registering with the apps. This comes in the wake of a number of scandals that have attracted negative attention to the rising industry. For instance, several female customers were sexually assaulted during their respective rides.

Many netizens have also complained about the varied quality of drivers on different car-hailing apps.