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Workers who enjoy one too many pints after work could face being thrown off projects, after new health and safety rules by Bovis Lend Lease come into force later this month.

From 14 September, the construction giant will conduct random on-the-spot drug and alcohol tests across 15% of its sites, giving project directors just half an hour鈥檚 notice.

Any individual found to have 29 milligrams of alcohol per 100 millilitres of blood or more will immediately be removed from site. If they are directly employed by Bovis, they will be offered help, such as counselling, or face disciplinary action, depending on the case. The current drink-drive limit is 80mg of alcohol.

Jeremy James, head of UK health and safety at Bovis Lend Lease, said the move was part of a package of measures intended to boost site safety. He said: 鈥淭his is an issue across society, and an area we felt was right to tackle. We are already improving tower crane safety.鈥� He added that the firm was banning semi-automatic quick hitch machinery on diggers.

The move follows similar action by Laing O鈥橰ourke and specialist contractor Byrne Brothers, which already conduct spot checks on workers. Laing O鈥橰ourke recently revealed 114 of its 980 employees failed tests on 88 sites in Europe in 2008/09, mostly for cannabis.

You could even test positive for using mouthwash half an hour before

Dr Guy Ratcliffe

However, while Laing O鈥橰ourke broadly employs the legal driving limit as its cut-off for alcohol, Bovis is adopting a stricter line.

Dr Guy Ratcliffe, medical director for the Medical Council on Alcohol, said: 鈥淭he levels quoted are extremely low. I suspect that initially quite a lot of people will test positive.

鈥淚n theory, a worker could have a bottle of wine with dinner, go to bed around midnight and go to work the next morning with an alcohol level higher than the 29mg quoted. You could even test positive for using mouthwash half an hour before.鈥�

One construction worker described the initiative as 鈥減olitical correctness gone mad鈥�.