AlcoSense, which produces morning-after alcohol breathalysers, advises drivers not to drink and drive because there is no way to avoid a positive police breathalyser test.

In the wake of the drink-drive prosecution of rugby star JPR Williams, the company has released a list of common breathalyser cheat tests, warning that none is effective if the driver is over the limit.

Strong coffee after drinking does not sober a driver, no matter how much is consumed, caffeine does not have the effect of restoring judgement either.

As JPR Williams discovered, sucking a copper coin or putting metal in the mouth does not trick a roadside breath test.

Actually making the breath reading higher than it is, some people wrongly believe holding their breath will lower the reading.

Hunter Abbott, chief executive officer of AlcoSense, said if someone has been drinking "there is no escaping a positive result".

He said the best advice to drivers would be not to drink and drive.

This advice has been echoed by road safety charity Brake and insurer Direct Line. They are currently campaigning for a significant reduction in alcohol level limits for drivers.

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