I'm guilty of this so don't flame, but expressed consent is the key term here... As soon as you were issued a license you consented to chemical tests when asked to prove you are safe to operate a motor vehicle on roadways. It's all in the writing when you went and got your license- I know I didn't read it either.

The question I have on all this- what about sovereign citizens? I've seen examples of these people not having state issued DLs and not having actual plates on their cars (some are downright atrocious attempts at "art"). Technically they don't apply when it comes to expressed consent, but also technically they are legally not allowed to drive on public roads within the state of Colorado. And it's even worse to hear some of them do not recognize the authority of any police department or deputy, only the duly-elected Sheriff of that county.