made significant investments and improvements and will continue to work with state and local governments to get it right in the future. to conduct its background checks, uber and lyft both use a company called checker which uses a potential driver's name and social security number to search federal, state and local courts and other databases for disqualifying records. regulators tell cnn that is not enough. and that government-run background checks that include fingerprinting potential drivers would go further in discovering histories of violence. but uber says fingerprints don't offer a complete picture of arrests and convictions. and uber has gone to great lengths to fight any government-run background checks. >> that's their game plan in every city and state. we'll get a law passed that's just for us. it's their own special law for uber and lyft. >> reporter: a cnn investigation tallied more than 400 lobbyists across the country hired by uber. mostly to fight stricter