Almost *anything* can be gamed
What a surprise: people respond to incentives. Again. Still.
California's generous recycling redemption program has led to rampant fraud. Crafty entrepreneurs are driving semi-trailers full of cans from Nevada or Arizona, which don't have deposit laws, across the border and transforming their cargo into truckfuls of nickels. In addition, recyclers inside the state are claiming redemptions for the same containers several times over, or for containers that never existed.