[DiabloD3]

Yes, and they must complete the dosing regiment. I can't find a good link on it, but the regulation is part of the larger 2015 FDA Veterinary Feed Directive.

I'm not sure if it applies to chicken, however Perdue has been trying to save its damaged brand by removing antibiotics also used for humans entirely (about a decade ago), and semi-recently announced that only half of their chicken used any antibiotics at all and none used off-label; they also have antibiotic free sub-brands.

This is notable because Perdue is the third largest chicken product company, after Tyson (Tyson, Jimmy Dean, Hillshire Farm, Sara Lee, Ballpark, Wright's), and JBS (Pilgrim's, Swift, Plumrose), although both Tyson and JBS produce twice (each) as much chicken as Perdue does (giving Perdue 1/5th of the market).