All new Uber drivers in American markets will now need to undergo federal and county background checks, the private cab and ridesharing network announced in a blog post yesterday. The new checks will also be run on current Uber drivers who have not yet been cleared against federal and county criminal databases The new checks will be introduced in addition to Ubers existing policies for all US drivers. The fifth, UberX, offers an ad-hoc ridesharing model where passengers are connected with independent drivers contracted to Uber.