It probably never crossed Fabian Schmidt’s mind that he wouldn’t breeze through security at Boston’s Logan Airport. A legal resident of New Hampshire, he flew back to the U.S. on March 7 after a visit to Luxembourg, but never made it through security. Accordi…

That same principle applies up and down law enforcement, including immigration. The entire Deferred Action for Childhood Arrivals (DACA) program is an exercise in executive discretion, with the gover…