>>3545258 (lb)

I was married to a retired Coastie for a while. She pointed out that the Coast Guard are in a separate Department of the gov't specifically to meet the demands of Posse Comitatus.

She also pointed out that there were times when they would put one Coastie on each USNavy vessel that could be assisting them in order to fulfill the same demands. That Coastie would make the actual arrest…

I assume the same could be done using the Border Patrol.