https://www.tsa.gov/sites/default/files/tsa-210819-6-4_4-ea-1546-21-01b.pdf 49 U.S. Code § 114.Transportation Security Administration This law grants the TSA authority to create temporary law with Emergency Executive Orders https://www.law.cornell.edu/uscode/text/49/114 And here is the original Emergency Executive Order that they keep extending https://www.tsa.gov/sites/default/files/sd-1582_84-21-01.pdf