Once the agent said the word “isotope,” Jones says he realized he was the one they were looking for. He raised his hand to say he had a nuclear stress test.

The tests can leave patients emitting radiation for some time. After showing identification and proof of the nuclear test, Jones and the other passengers were allowed to go on their way.

He says he’s satisfied with the way authorities acted, “knowing there are people on the lookout for this type of thing,” and was pleased with the way officers and passengers behaved.