Dr. Mann, equipped with his

Dr. Mann, equipped with his hidden "wearcam," went into chain stores and innocently asked why there were domes on the ceiling. He secretly filmed the employees' evasiveness and their defensive responses — "They're here for your own good" — and then reached into his bag and pulled out a video camera of his own. At that point, he was usually kicked out of the store. "Of all places I go, it's the casinos and department stores and police stations that object most strongly to my apparatus," he said. "And yet those are the places where I feel it's most needed to prevent what would be a one-sided totalitarian regime."