Imagine an anti-counterfeiting tag that:
Is inexpensive & unobtrusive.
Is very difficult to counterfeit in large numbers.
Can be automatically checked by wholesalers, retailers, or volume end users (with an inexpensive reader).
Can be checked by consumers (without a reader).
Typically detects more than 98% of the fakes examined.
Effectiveness scales automatically with the level of concern.
Does not become easier to defeat over time, or as technology advances.