Cal. Food & Agric. Code § 10753

It is unlawful for any person to knowingly bring into, or cause to be brought into, any sales yard any swine that have been, within 21 days, treated with hog cholera virus, or which are affected with, or have been exposed to hog cholera, anthrax, swine erysipelas, vesicular exanthema, foot-and-mouth disease, or any other infectious disease.