A Detroit suburb audited its own license plate cameras and found police in Houston and Dallas searching its residents' data over 10,000 times a month. Ferndale itself broke 1,000 searches in a month exactly once. The police chief canceled the Flock contract without waiting for a council vote. That audit explains the mood behind the Halloween jokes. Flock built the largest private location database in American history without a single act of Congress. The mechanism was a checkbox. Share your…