I can go anywhere I want

So this Department of Water Resources representative stops at a Texas ranch and talks with an old rancher. He tells the rancher “I need to inspect your ranch for your water allocation.” The old rancher says, “Okay, but don’t go in that field over there.” The water representative says, “Mister, I have the authority of the Federal Government with me. See this card? This card means I am allowed to go where ever I wish, on any agricultural land. No questions asked or answered. Have I made myself clear? Do you understand?” The old rancher nods politely and goes about his chores. Later, the old rancher hears loud screams and spies the water representative running for his life and close behind is the rancher’s bull. The bull is gaining with every step. The representative is clearly terrified so the old rancher immediately throws down his tools, runs to the fence and yells at the top of his lungs, “Your card! Show him your card!”