Violation of due process?

http://www.wtoc.com/story/25778795/operation-thunder-enforcing-dui-tests If you get stopped by a police officer on the suspicion of DUI, then you have the right to refuse a breathalyzer test. However, this police department is working with judges to secure no-refusal checkpoints. If you refuse they will get a... show more http://www.wtoc.com/story/25778795/opera...

If you get stopped by a police officer on the suspicion of DUI, then you have the right to refuse a breathalyzer test. However, this police department is working with judges to secure no-refusal checkpoints. If you refuse they will get a warrant for a blood test. However, due process means that the police officers would have to have probably cause for a judge to give them a warrant. If the judge is handing the warrants out on request without any cause, then aren't they violating due process?
If someone is drinking and driving, the officer can smell it, etc.. then there is your cause. If I simply refuse a breathalyzer then there is no cause. How can a judge who is supposed to be upholding the law, including personal rights, even agree to do this?
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