36 CFR 211.3: Cooperation with State officers.

All forest officers will cooperate with State officials, insofar as practicable, to enforce State fire, game, and health laws. They are authorized to accept appointments, without compensation, as deputy State fire wardens, game wardens, and/or health officers whenever in the judgment of the Chief of the Forest Service the performance of the duties required by these offices will not interfere with their duties as Federal forest officers.