. >> reporter: sofia lu was in a san francisco crosswalk when the 7-year-old was hit and killed by a car. the driver was working for uber. >> after i lost my daughter, i just feel i want to die too. >> reporter: uber denied responsibility because the driver who had a previous conviction for reckless driving didn't have a passenger at the time. uber says it performed a background check but won't comment whether it knew about the conviction. in boston an uber driver was charged with raping and kidnapping a female passenger. the company says that driver passed a background check. they are two incidents that have some questioning whether a ride in an uber car is a safe one. uber screening doesn't check the fbi's criminal database like many taxi companies do. uber outsources its background checks. san francisco is suing uber. district attorney george gascon saying screenings are inadequate because they don't include fingerprinting. >> if you read their website, there's all this language about how they're striving to make this a safe experience for the driver. and when you start reading th