An anonymous reader writes: A few years ago, we heard tales of vans outfitted by the U.S. government to hold giant X-ray scanners, which they'd use to drive around and inspect vehicles. Now, it turns out similar vans have made their way to police departments, including the NYPD. The police are unwilling to explain (PDF) how they're used, or how often. "A state court has already ruled that the NYPD has to turn over policies, procedures, and training manuals that shape uses of X-rays; reports on past deployments; information on the costs of the X-ray devices and the number of vans purchased; and information on the health and safety effects of the technology. But New York City is fighting on appeal to suppress that information and more, as if it is some kind of spy agency rather than a municipal police department operating on domestic soil, ostensibly at the pleasure of city residents."