After an investigation Criminal_investigation , a Virginia special justice declared Expressing_publicly Cho mentally ill and ordered Request him to attend Participation treatment ; however , because he was not institutionalized Institutionalization , he was still allowed Preventing_or_letting to purchase Commerce_buy guns .

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 ) .