01
Licensing is decided by an agency, not an employer
A large share of U.S. jobs requires some form of license, certification, or registration — healthcare, security, cosmetology, real estate, childcare, commercial driving, trades, and many more.
When a licensing rule blocks a role, the employer usually cannot override it. That is a good thing to know early, because it tells you where to direct your effort: to the agency, not the hiring manager.
No single authoritative source covers this nationally, so there is nothing to cite here. Treat it as orientation and confirm the detail where you live.