[SauronOfMordor]

Hmmm, I often drive around at night with a camcorder on. Especially as I approach a DUI checkpoint (which have to be announced). Could we have a little setup here?

Or perhaps somebody who had previously been rousted in a checkpoint before, and was prepared this time?

[UpAllNight]

--Or perhaps somebody who had previously been rousted in a checkpoint before, and was prepared this time?--

No. More like his liberal teacher had 'prompted' him on how great it is to get police brutality on film.