But where your argument falls down is that the Police routinely set up stop-checks and breathalyse everybody they stop during drink-driving campaigns. I myself was breathalysed twice in 20 minutes at the same checkpoint once, when I was driving a clearly marked licenced taxi, didn’t smell of alcohol (because I hadn’t been drinking), and hadn’t committed any road traffic offence. So that’s a random breath test.
It is the same as breathalysing both drivers in an accident that is clearly the fault of one party. For instance if someone hits you up the arse at a traffic light or junction, then breathalysing the person that was hit is totally unnecessary and random as there are no grounds to indicate drinking and driving, but that’s what happens 