From Guns.com:

In 2016, long-time Ameren Illinois company employee Bryan Knox consented to a search of his vehicle in a company lot that yielded a firearm. Terminated under Ameren’s Workplace Violence policy, his union appealed the firing and an arbitrator determined that he had been wrongfully dismissed because of protections offered by state law for guns in personal vehicles. While a District Court overturned the arbitration results after Ameren went to court on the matter, a panel of the 7th U.S. Circuit said last Friday that the law was, in fact, on Knox’s side.