London Riots - My idea on how to deal with looters.

Anti-riot: Operation 
Cup of Tea

Everything seems to have quieted down now, although we've been hearing a lot of sirens in the background today. I live in a residential area not near any shops so have had no looting locally, although I've heard rumours of local high streets being hit.
I've seen the idea bandied about to hit looters and rioters with water cannons loaded with smart water or indelible dye, which I think is a lovely idea. That way, all those present can be easily identified later. There is no such thing as an 'innocent' bystander. The police very clearly asked people to stay in and stay away so they could get to work. Anybody still spectating would be actively hindering police and fire departments from doing their job.

But what to do with the looters once they're caught? Put them in jail? What's the