bjcc
Yes a rumour about the handcuffs, but this is 'Rumours and News'.
I agree it's hard to believe they'd do that but, as in all jobs, you get OTT types so it could be true.
Second - you've moved your goalposts from "if you haven't had too much to drink" to "if you have not been drinking".
As I understand it portable breathtest kits used for screening aren't always accurate (cuts both ways of course) so you could fail your screen-test and be arrested even "if you haven't had too much to drink".
Be clear - all I was pointing out is it's very easy to be blase about "that's the end of the matter" if you're the policeman but not so easy for the person arrested, even if it comes to nothing because the more sophisticated machine at the police station shows he's innocent.
Arresting people is all part of a day's work for the police, but being arrested must be traumatic for ordinary decent people.