DVD has said most of this, but i'll post a bit more bluntly.
The Police can stop any driver at all, at any time, to check to see if they have a driving licence or insurance.
Once you've done that, if you suspect someone has been drinking alcohol, you can demand a breath test.
There is nothing in theory to stop a Police officer from using that first power (i.e. check D/L or Insurance) to investigate that bit and also see if once stopped they then need to instigate the second power (demand the breath test). Some might say it's unthecial to use the first power purely because you want to consider using the second one if need be..but..that's negated if you genuinely want to check the driving docs AND consider drink/driving... and just using the first power alone might well come up with offences on their own, so it's a perfectly legitimate tactic.
Which is why we do not need ramdon breath test powers in this country.
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