The shooting Use_firearm prompted Causation the state of Virginia to close Openness legal Legality loopholes that had previously allowed Preventing_or_letting individuals adjudicated as mentally unsound to purchase Commerce_buy handguns without detection by the National Instant Criminal Background Check System ( NICS ) .

The law strengthening Cause_change_of_strength the NICS was signed Sign_agreement by President George W. Bush on January 5 , 2008 .