Originally Posted by
myrridin
There may well be some variation, but I believe they require a warrant to compel a blood alcohol test or breathalyzer . Like any other application of the 4th amendment, a court issued warrant meats the due process requirement.
Not if it's an implied consent state like CA.
http://dmv.ca.gov/pubs/vctop/d11_5/vc23612.htm
You either test, or you lose your license. The level of testing is based on the officer's discretion.