I was out walking with a friend in San Francisco, and ran into one of his old friends he hadn't seen in three years. This guy said he had been abducted by alien

I was out walking with a friend in San Francisco, and ran into one of his old friends he hadn't seen in three years. This guy said he had been abducted by aliens a thousand times, since. I only realized later that meant every time he slept. After you have been Probed, how can you assume the you they let go was the original?