Digital Water Marks Thieves

[Matt Crawford]

On Feb 15, 2005, at 12:40, R.A. Hettinga wrote:

> Instant, is a property-marking fluid that, when
> brushed on items like office equipment or motorcycles, tags them with
> millions of tiny fragments, each etched with a unique SIN (SmartWater
> identification number) that is registered with the owner's details on a
> national police database and is invisible until illuminated by police
> officers using ultraviolet light.

That's amazing!  How do the tiny particles know that it's not a 
civilian illuminating them with ultraviolet light?

And how does Wired reporter Robert Andrews fail to ask that question?


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