There are problems in the UK and Ireland with unlicensed young people causing trouble on scramblers (off road motorcycles) and motorcycles being used for crime in general. There have been an increasing number of fatalities of both riders and pedestrians and several high profile deaths that occurred during police pursuits. It makes sense to tag and investigate later than risk a fatal chase.
I'm curious, how does it work? How is the liquid in each bottle unique?<p>Unique molecules, like RNA chains? Unique mixture of molecules? Can it be identified without a big lab, like sequencing equipment?<p>Sounds like an interesting problem they have solved, but the sauce is likely secret.