The NYPD is deploying a "hand-held" backscatter x-ray scanner to do walk-by strip-searches; it's not out of the realm of possibility to have any even smaller model.

Between that and the already present Z Backscatter Vans, NYC is a glowing city, and I don't mean that plume of light coming from Times Square. As I recall, the ZBV's give out 4x the radiation of the nude-o-scopes and the handhelds even more.