Everyone has a different constitution and ability to 'hold their alcohol' in terms of obsorbtion time into the bloodstream and the time taken to process the alcohol out of the system. Peoples stature and size will also effect individual levels of blood/alcohol content.
Below is a table of the legal alcohol content limits for driving in various countries around the world. Please note this chart is compiled to the best of our knowledge but should only be used as a guide.
The Health and Safely Executive has published this document for businesses requiring advice on dealing with alcohol-related problems at work."A guide to employers on alcohol at work"