>0.5 per mg - Belgium, Bulgaria, Denmark, Germany (Germany is 0.3 if you’re in an accident)

To be exact: you are probably toast if over 0.3 in an accident (unless the other driver is above 2.0), you can be heaviliy fined if they find 0.3 after stopping your car because of mistakes/unsure driving. Only at fixed road block you need to be above 0.5 to be in trouble.