Driving whilst drunk in the UK is considered a serious criminal offence and if found to be over the limit while driving, a motorist could be sent to prison. The legal limit for alcohol consumption is 80mg of alcohol per 100ml of blood, 35mg of alcohol to 100ml of breath or 107mg of alcohol per 100ml of urine.
Police are allowed to stop motorists and ask them to take a breath test if they have reason to believe that the driver is over the limit. Refusal to do so could result in prison sentence, a fine and a driving ban.
The maximum penalty for driving above the limit is a six months prison sentence plus an uncapped fine. In addition the motorist will be banned from driving for a minimum of 12 months, or a minimum of 3 years, if there has been a previous drink driving conviction in the past 10 years.
Drug driving is also considered a criminal offence and the penalties are the same as those for drink driving