alt Hacker NewsIt's also an offense in most (all?) of the US. Even then, if someone is pulled over for DUI, at that point the officers are just collecting evidence. If someone has had anything to drink, it's in their best interest to say they want a lawyer and refuse all tests. Then there will be less evidence to argue against in court.
I would love to be corrected, but I was under the impression if you refused any testing, your driving license will be revoked. Drivers license is a privilege, not a right.