John has an arrest warrant out on him for stealing rare coins. The police arrive at John's house to arrest him. When they get to the door John asked if he can change pants. The police pat down John and do not find any evidence. Then they allow John to go change his pants, but the police follow John into the bedroom. When John pulls out his pants from the drawer a a coin falls out and the police officer identifies it as the stolen coin. He tells the police to leave the coin alone. They arrest John and he is convicted of stealing the coins. Is this a legal search and why