I can't help wondering if this will turn out to be the thin end of a very nasty wedge...

http://www.mayorwatch.co.uk/london-pilots-sobriety-tag-scheme-to-cut-alcohol-related-crime/

Like many things, it makes some sense, but how long will it be before it is "extended" or has its intent abused?

A close eye will have to be kept eye on this. The words 'tag creep' come to mind.

We've seen it so many times Lex. These things are introduced for the good of society and rapidly become curtailers of our hard won freedoms.

Look at the RIPA act and how that's been abused!