I was led to a windowless security room in the back of the store, detained for an hour and accused of deliberately switching a more expensive item into a cheaper box. My stunned protestations and explanations were summarily dismissed. My driver's license and credit card were temporarily confiscated, I was told to expect a civil notice of a fine by mail, and finally, I was advised never to return to the store.Though no law enforcement or court was involved, I was effectively tried, convicted and punished for a crime I didn't intend to commit.