RCW 16.57.280: Possession of cattle or horse marked with another's brand—Penalty.

(1) No person shall knowingly have possession of any cattle or horse marked with a recorded brand of another person unless the:

(a) Cattle or horse lawfully bears the person's own healed recorded brand;

(b) Cattle or horse is accompanied by a certificate of permit from the owner of the recorded brand;

(c) Cattle or horse is accompanied by an inspection certificate;

(d) Cattle are accompanied by a self-inspection certificate meeting the requirements of RCW 16.57.010;

(e) Horse is accompanied by a bill of sale from the previous owner; or

(f) Cattle or horse is accompanied by other satisfactory proof of ownership as designated in rule.

(2) A violation of this section constitutes a gross misdemeanor.