Caffeine test strips?

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Would you care to know if your de-caf coffee at a restaurant is actually (perhaps accidentally) caffeinated? There's a product out now called d+caf test strips, which will actually tell people who are a little more.. strict about their caffeine intake, whether or not a cup of coffee has any caffeine in it. You can buy a pack of 20 for $9.95. Apparently it's main purposes are to test coffee and tea at restaurants, that claim to give you caffeine-free versions. I guess these products are for the sticklers who insist on their drinks being caffeine-free. Perhaps because I love my caffeine, I would never really care to buy these in the first place. But I'm wondering if there's anyone truly out there who abhors consuming caffeine so much that they would actually buy a TEST strip? And not trust the restaurant or label on the drink they're buying? What do you think?