The stolen apple- Detective Riddle

A queen had a bowl of golden apples in her court which were her most treasured possession. One day, one of the apples went missing. She gathered all the members of the court together and told them that the way she would discover Jagga was by having them all touch a rusty pot with a rooster in with the lights off. The rooster would then crow when Jagga touched the rusty pot. However, the rooster didn't crow throughout the whole court, touching the rusty pot. Despite this, the queen knew who had stolen the apple. How?

By touching the pot, the members of the court would end up with rust on their hands. The robber would have been too scared to touch the pot in case the rooster crowed, so he wouldn't have any rust on his hands. By touching the pot, the members of the court would end up with rust on their hands. The robber would have been too scared to touch the pot in case the rooster crowed, so he wouldn't have any rust on his hands.