Kyles the meter might not be accurate? the procedure might not have been right? etc etc.
It seems to me that one pint, without any residual alcohol from lunch or the night before, is a bit surprising for a man, or frankly an average sized woman to take them over the limit. of course meds, food etc etc make a difference. If you're over, you're over. I agree with all of that.
But
If you're marginally over, and you're not actually hurting anyone, should you get a ban? In this case the OP's husband was probably stopped for using his phone. Quite right too - that is really dangerous. the dd limit is arbitary. if in fact the test might be compromised, then, for goodness sake check it out.
If you are worried about rabid drink drivers:
real dds won't care two hoots about this
if you live in the country, many people will dd on a minor and completely innocuous scale so they have a social life. not trying to justify the 17 yo with 10 pints under his belt, but a man whose drunk one pint of reasonable strength beer isn't going to be more of a menace on the road than the frazzled school run mum with no booze and three fractious kids. IMO