Are there any cases of missing persons where the primary suspect is a member of law enforcement? Could you summarize one for me?
Yes, there are a handful. One of the most disturbing cases involves two men who disappeared after being last seen with the same officer:

Terrance Williams and Felipe Santos both disappeared from Naples, Florida, after being stopped by the same sheriff's deputy: Steven Calkins. Calkins claimed that he gave both of them rides, but their families and friends believe that he killed them.

Santos was a 23-year-old undocumented Mexican immigrant who was last seen on November 16, 2003. He was driving with coworkers to work when his vehicle struck another vehicle. It is unclear who was at fault. Calkins took Santos into his patrol car and claimed he had released Santos at a nearby Circle K after writing him a couple of citations. However, Santos was never seen again and no evidence exists to support Santos was ever at the Circle K.

Williams was a 24-year-old black man who was last seen on December 12, 2003. He was illegally driving an unregistered white Cadillac when he was stopped by Calkins. Calkins claimed he gave Williams a ride to a nearby Circle K, but no evidence exists to support Cakins' story. Calkins had the Cadillac towed, then lied about the entire incident just a few days later to a dispatcher who called him on his day off.

There is evidence Calkins lied to investigators from his own department and there are many inconsistencies in his stories. He was let go for this reason and was investigated by members of his department, the FDLE, and even the FBI. However, no charges were ever filed. He remains the only person of interest, according to his ex-sheriff. A civil suit was filed by Williams' mother, which was ultimately lost. The cases of these two men remain unsolved.
