Lollygagging drivers, cross your fingers! Chalking—the common practice of marking car tires to see who’s been parked too long—is a search under the Fourth Amendment. That, holds the Sixth Circuit, is what a trespass-based legal theory requires. If law enforcement searches a car by affixing a GPS tracker to it (as the Supreme Court held in 2012), they also search a car by putting chalk on it. Stay tuned to the ongoing litigation to see if that means chalking searches are unconstitutional.