Those challenges were evident in 2007, when a gunman at VirginiaTech shot and killed 32, and Democratic Gov. Tim Kaine called for closing a loophole in the law allowing for private sales at gun shows without the same background check that licensed dealers are required to obtain.
In the 2007 shootings at VirginiaTech, which resulted in the deaths of 33 people, gunman Seung-Hui Cho had been considered dangerous by a court and ordered to get outpatient treatment.