Politech has an artice that will piss you off!
"The Gilpin County Sheriff's Office in Colorado, a rural area not that
far west of Denver, recently set up a highway checkpoint where motorists
were stopped and, at least in some cases, not allowed to leave until
they gave breath, blood, and saliva samples for the benefit of a private
research firm. A report by Ernie Hancock says the National Highway
Traffic Safety Administration was involved as well."