The TSA has no business looking for drugs, outstanding arrest warrants, or immigration problems unless it has serious reason to believe that the person involved poses a serious threat to air safety. If it is going to serve as an extension of every other sort of law enforcement, then its searches should be subject to the same requirements for probable cause, which would allow almost everyone to travel without submitting to TSA examination.
This mission creep recalls InstaPundit's prescient post at 1:49 p.m. on September 11, 2001:
It's Not Just Terrorists Who Take Advantage: Someone will propose new "Antiterrorism" legislation. It will be full of things off of bureaucrats' wish lists. They will be things that wouldn't have prevented these attacks even if they had been in place yesterday. Many of them will be civil-liberties disasters. Some of them will actually promote the kind of ill-feeling that breeds terrorism. That's what happened in 1996. Let's not let it happen again.
And that's exactly what happened.