Persons conducting a whitewater river trip must be able to show proof of operating with a valid outfitter license to law enforcement officials. Proof of having a license must be available at the site where vessels are put into the river, or at the site where vessels are taken out of the river. The proof of having a license is not required to be carried on vessels during a river trip. A photocopy of the original master license that was issued with "whitewater river outfitter" printed on it will be accepted as proof of having a license.