General comment for those who are wondering about TX NG law enforcement authority etc.
Posse Comitatus applies to Federal troops- meaning that NG on State Duty are not necessarily limited by PC. They can be granted LE powers to arrest detain etc. PC applies to NG only when on Federal Duty as US Army personnel.
There are more details and specifics, but Gov. Perry could give them a fairly wide amount of LE authority.
Perhaps the Texas Gov. should give the order to “shoot on sight” anyone close or near to the American side of the border. That just might reduce the number who try to cross illegally. Would that make the Sheriff’s happy?
(Geeesh, that might even work)