Navy Yard Shooting

The killings at the Washington Navy Yard have raised concerns about security clearances -- not just who's granted access, but who's doing the background checks.

FOX News Radio's Rich Johnson reports from Washington:

One big target of  concern is CSIS,the company that conducts thousands of background checks for the federal government. It did the check of Navy Yard shooter Aaron Alexis, as well as NSA leaker Edward Snowden.

Senator Claire McCaskill is calling for a full investigation in light of what she labels a pattern of failure on the part of CSIS.

Also, the AP took a look at how federal workers and contractors are are screened. Its conclusion: The system is so unreliable, it's nearly impossible to adequately check the some-five-million people who have security clearances.

In Washington, Rich Johnson, FOX News Radio.