Most Customs regulations are codified in title 19 of the CFR. Note however that other agencies also regulate imports, depending on the product. Thus, for automobiles, the Environmental Protection Agency is involved; for wine, the Bureau of Alcohol, Tobacco, and Firearms. Their regulations may be contained in other titles of the CFR. There are multiple formats of the CFR:
Customs and Border Protection also issues documents known as CBP Decisions (formerly known as Treasury Decisions, which should not to be confused with the Treasury Decisions issued by the Internal Revenue Service). CBP Decisions are varied; they include notices of CBP policy, CBP rulings, court decisions, and changes to CBP customs regulations.