I don't think it's about a special breathalyser for diabetics Ded. If you blow a positive in Plods hand held machine he takes you down the station for testing on the more sophisticated machine. If that's positive then you're quite rightly

and it's bye bye driving licence.
If you're going to nick someones job then you need to be sure. Secondary testing gets rid of all arguments. Why test the urine for everything apart from Alchohol
