The alleged gunman who killed seven employees at two Half Moon Bay, California, mushroom farms was apparently distraught over a $100 repair bill he was required to pay for damaged equipment. The Jan. 23 shootings were just the latest in a spate of workplace violence episodes across the country.

Although no employer can completely eliminate the risk that an employee will commit violence at work, companies can implement compliant policies and procedures to minimize that risk. In the three decades since the term “going postal” entered the lexicon, workplace mass shootings have outpaced school shootings, but little attention has been focused on what employers can do in advance.