One should have right to demand a blood test.To many people can't pass field with out having a drink or smoke.To many have disabilities,old,whatever.
You can. Refusing the field test allows them to arrest you. But it isn't sufficient to charge you. They also have to offer you a breathalyzer at the station and you can refuse that but demand a blood test.
But your car still gets towed even if you pass the tests at the station and don't ultimately get charged because you refused the field test.
I don't understand how simple DWI testing is like that in your country. 3 seconds of a certified calibrated breathalyzer is sufficient, this walking in a straight line and saying the alphabet backwards sounds like a joke.
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He refused a blood test as was his right, and probably the correct decision given that this "top cop" (ie, the one they say had by far the most DUI arrests) was a criminal and shown to break the evidence chain of custody.
That's because field sobriety tests aren't designed to find out if people are actually impaired, they are designed to give cops a reason to arrest people purely on their own discretion even when they otherwise lack any evidence of wrongdoing. And in doing so it boosts both the local cops and court's funding through mandatory court fines and fees and programs when they hammer down on people too poor to afford a lawyer.