9 CFR 95.18 – Wool, hair, and bristles; requirements for unrestricted entry
Wool, hair, or bristles derived from ruminants and/or swine which do not meet the conditions or requirements specified in any one of paragraphs (a) to (d) of this section shall not be imported except subject to handling and treatment in accordance with § 95.19 after their arrival at the port of entry: Provided, however, That no bloodstained wool, hair, or bristles shall be imported under any condition:
(a) Such wool, hair, or bristles may be imported without other restriction if originating in and shipped directly from a region not declared by the Secretary of Agriculture to be infected with foot-and-mouth disease.
(b) Wool or hair clipped from live animals or pulled wool or hair may be imported without other restriction if the said wool or hair is reasonably free from animal manure in the form of dung locks or otherwise.
(c) Wool, hair, or bristles taken from sheep, goats, cattle, or swine, when such animals have been slaughtered under national government inspection in a region
(d) Wool, hair, or bristles which have been scoured, thoroughly washed, or dyed may be imported without other restriction.