There's a bridge near Detroit that is apparently easy on the Canadian side to accidentally head across the border into America. Used to be they'd just turn you around and sent you back, but I read at least one story of a guy who got detained in an American facility for a few weeks before he could back him, and all he did was take a wrong turn.
They've still got a 3000 per day quota, and they've never hit it, so they aren't looking for excuses to NOT arrest people, even if it gets kicked later. That's why they've found that something like 75% of ICE arrests have been bogus. If anything, the likelihood is that they'll get MORE aggressive, not less.
MAGAs: "We'll just tell them to only kill Libz. Problem solved. Hey, How're they doing getting DNA out of those fossilized dinosaur bugs?"