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Re:In Colorado, a look at life after marijuana legalization by peppaz on Tuesday February 23, 2016 @05:34PM (#11162911)
They need a warrant to draw blood and really can only get one if you injured someone or destroyed their car.

http://www.larryformanlaw.com/blog/can-the-police-take-my-bl...

Re:In Colorado, a look at life after marijuana legalization by cdr on Thursday March 03, 2016 @01:34PM (#11218840)
That link does not contradict what I wrote. In many (most?) states you must voluntarily submit to a blood test or face the above consequences.