Ankle tags to monitor offenders' alcohol consumption
31 July 2014 Last updated at 15:33 BST
Repeat offenders convicted of alcohol-related crimes will be forced to wear ankle tags that monitor their drinking, under a new pilot scheme.
The mandatory tags record levels of alcohol in the sweat every 30 minutes.
The 12-month trial in four London boroughs gives courts the ability to ban people from drinking alcohol.
Caroline Hepker reports.