They are traveling through Missouri from Oklahoma and stopped at the local Walmart, where someone noticed they were carrying and, as is the indoctrinated response in America, notified the authorities that they were scared.
The local police respond with typical Barney Fife effectiveness, and a chorus of show me your ID. Apparently, in Missouri, if you don’t know how to handle a situation, cops are taught to default to ID showing. This guy apparently doesn’t get out much, as he isn’t satisfied with a passport, which is supposedly the best form of ID and is accepted internationally. Other countries, yes, but Marshfield MO needs some “real ID”