[accyman]

they could paint the drains as they replace them with smart water like they are doing on a lot of metal these days but i have no idea of the expense or how long it would stay on the drain for.From what i have been led to believe they can trace each instance of smart water to a particular item as it can be coded and logged as to which particualr mixture was used on what and where.

Apparently it shows up under UV light ad merely touching it leaves traces on the skin for up to 7 weeks.

SmartWater is a forensic property marker that can be used on valuable and/or easily removable items. No two SmartWater solutions have the same forensic code, meaning that marked items can be traced back to where they came from, provided that the solution applied has been registered with SmartWater. This also means that criminals can be linked with crime scenes. The solution is invisible under normal light, but glows brightly under UV light, making it easily identifiable by the police. Paint a fraction of vulnerable / at risk areas of metal with SmartWater, register the kit to your building and clearly display the signage supplied with the kit to deter potential thieves, especially as the SmartWater logo is well known among criminals and the signage alone is a major deterrent.