This report says it was not only voluntary (although some felt pressured) but the participants were paid for thier "donation": http://blog.al.com/east-alabama/2013/11/report_drivers_in_texas_partic.html This one does indicate that "voluntary" must have a different meaning to some people than it has to me: http://www.nbcdfw.com/news/local/North-Texas-Drivers-Stopped-at-Roadblock-Asked-for-Saliva-Blood-232438621.html
Yes and no I think. If a "uniformed officer" gives you an instruction to pull over, is the average law abiding American going to ignore such an instruction? I think they are playing both sides here. Paying them to get around what is a borderline infraction of your civil rights of pulling you over without just cause. As a boy and young man my father drummed into me the attitude that in any interaction with a peace officer to say "yes sir", "no sir" and "thank you sir", and to save any criticism for my appearance in front of a judge. Lets be honest, most of us get butterfly's in our tummies when a police cruiser follows us for more than a mile, even if you know you have not done anything wrong. Like I said I'm not a conspiracy nut, but this sounds just wrong.
It is wrong. They used off duty officers in order to get around having to justify it to the local agency. They used uniformed officers to give the "appearance" of officially sanctioned and under proper authority. The Feds used non-sworn, non-law enforcement contractors to gather the data. They said it was voluntary, but used the inference that it was required to obtain cooperation. Washington needs to back the f_ _ _ up, they keep pushing and they're liable to bite off more than they can chew. There are a hell of a lot more of us than there are of them.
From one of the articles it went beyond this. One lady on being informed it was volentarry basically said she wasn't interested but they pretty much forced her into the parking lot anyway. That goes beyond "inference" IMO. Definitly wrong. The question at what point up the chain did they step over the various lines.