Makes sense, I’m afraid. You can’t have two groups patrolling the border without risking one of them shooting the other.
I wonder if it would be possible if these militia guys volunteered to be deputized by Arpaio, so they could work together, instead? That’s how it was handled in the old days when there was a serious threat to be confronted.
While it would be good to coordinate efforts enough to keep the units from tangling, to let out the information on where the Sheriff's units were going to be active might pave other corridors for drug runners. People would have to be able to maintain OPSEC, and in my estimation, that won't happen if enough people are aware of who is where.