Originally Posted by NaughtyVisions

Yeah, someone (I can't remember if it was Richard or _Rochard_) in one of the earlier threads posted a link to a big article about CRAFT. They had close ups of the "device," and acknowledged that it was a radiation detector.

Some people in the comments on that article also said they've see the CRAFT logo on people at other public evens in Boston, so perhaps the city hires them to provide extra security or something.