"The filming of anyone, including employees, is not something that is unheard of in the industry," McLain said. "But to do it in a changing room and bathroom is totally unprecedented and it could border on criminal activity." The retailer's "Security and Privacy" policy states that at "some stores and clubs [Walmart] may record your presence on security monitors for safety and security purposes," according to court documents. 

Sounds like a 'failure to adequately supervise' to me, and very expensive ...