Raise your glass to the new method of tackling alcohol-fuelled crime

For a trial period, London Metropolitan Police are monitoring the success of a new approach to alcohol-related crimes. If successful, the strategy will be enforced long-term, nationwide. Many of those arrested for these crimes in London will now be fitted with a tag around their ankle if they are released from custody- a tag which, if it detects alcohol in the wearers' blood and sweat, will warn the police. This strikes me as a very effective use of modern technology, though I hope that its potential will be deployed usefully with punishments that correspond with breach of the alcohol bans that these tags are intended to monitor for a period of a few months. Hopefully this will act as an efficient deterrent on alcohol-related crime, and result in more serious punishments for recidivists. If successful, I wonder if this would be a practical approach to drug-related crime as well...