Despite our efforts to prevent it, the specter of gun violence continues to haunt businesses, schools, and government offices throughout the USA. Many incidents involve a disgruntled employee seeking revenge against a supervisor or other employees, but many of the attacks take place at locations that attackers seemingly choose at random. The only thing that all of these incidents seem to have in common is that they involve highly motivated individuals planning quick and violent ambushes that often claim dozens of victims in a matter of minutes (or even seconds).