This Law Firm Publication by Epstein Becker Green addresses California Trucking Association v. Becerra, in which a California federal district court issued a temporary restraining order to enjoin the enforcement of Assembly Bill 5 (AB 5), just prior to its scheduled effective date of January 1, 2020. AB 5 codifies the ABC test used to determine whether a worker should be classified as an employee or independent contractor. Groups, including the plaintiff in this case, have argued that AB 5 is unconstitutional because it imposes an impermissible burden on interstate commerce or that it is preempted by the Federal Aviation Administration Authorization Act of 1994 (FAAAA).