A three-judge panel in Michigan has ruled that chalking a tire is a Fourth Amendment search, explaining further that it does not constitute a reasonable search.
Dulles, Reagan Airports Fitted With Biometric Scanners For Government Facial Recognition Pilot Program
Although no laws exist governing the use of facial recognition technology, no court has ruled on whether it constitutes a search under the Fourth Amendment, and neither checks nor balances exist to guide the program, the U.S. government is working as fast as it can to implement it in every major airport in the country.