Re: Drink and drive, a simple rule:
Weeeell, yes and do....do you mean "Had a drink? Never, ever get behind the wheel of a car ever again?" Seems a bit extreme.
The tricky bit is deciding if you had a drink or six some time ago, when is it safe to drive? Couple of pints at lunchtime - can you drive home after work at 7pm? 4 pints in the pub at night, are you safe in the morning?
What would be really useful is a pocket gadget to answer that question, something that I'd assume these things do. But as the article states
"...keen to stress that the results you get from their devices shouldn't be used to test whether you're safe to drive"
one has to ask what the hell the point of them is?