Nick Freeman says motorists could risk being over the drink-drive limit if they use mouthwash containing alcohol, as

"it can artificially inflate a reading, raising the risk of failing a breathalyser."

One of the best selling brands, Listerine, contains 21.6 - 26.9% alcohol.  Mr Freeman carried out his own test, sober, after gargling with alcohol based mouthwash and said:

"It produced a reading over the prescribed limit."

Following police guidelines, drivers should be asked if they have used mouthwash in the last 20 minutes and a police spokeman said:

"The small amount of alcohol in some mouthwashes does not reach the bloodstream and evaporates in seconds - making it undetectable by the time a breath test is carried out."

For more about this story:

The Mirror - Mr Loophole's drink driving warning over mouthwash