Could the Killer be a Cop?

With all these missing Texas Forty, has anyone look at Cops or Sheriff's? What about groups they are involved in? Just saw a movie called "Frailty". 

All these folks mysteriously vanish without a trace, no cell, not taking their medications with them etc...Well how will they just up and volunteer to vanish? Who has the authority, who would normally never get looked at as a suspect? Who has the ability to cover up or lose evidence? Are these folks acting as a group for their twisted religious reasons? 

This is something to research. I noticed that the majority of the missing in these cases are white. Is this cult involved?

Jim