Los Angeles and San Francisco are convinced that Uber's background checks aren't as good as the company claims they are, and it looks the two cities might have ample proof that this is a real, consistent problem. Their district attorneys have amended a lawsuit against Uber to provide evidence that the ridesharing outfit didn't unearth the criminal records of 25 drivers between the two regions. Several of those drivers were reportedly convicted of extremely serious crimes, including murder and sex offenses. The attorneys argue that this is proof that Uber is making "false and misleading" claims. It's touting a tight screening process, but genuine threats to passengers are slipping through the cracks.