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I think one of the PoC||GTFO having a “reversing a pregnancy test” that worked pretty much the same way.

https://raw.githubusercontent.com/tylert/pocorgtfo/gh-pages/...

> Chapter 6: Reversing a Pregnancy Test; or, Bitch better have my money!

> Each strip has an absorbent area (that you pee on) and a clear window where the test results show up. One stripe is a control stripe that ‘fires’ (changes color) in any liquid from water to bourbon, and the other one is a test stripe that only fires when suffi- cient concentrations of the hormone hCG are present in the fluid sample. (hCG stands for Human Chori- onic Gonadotropin, named because scientists snicker at words like “gonad.”) You can use the strips with- out the digital tester, because all you’re being sold is a device that will load in one of the basic strips, and monitor the control and test stripes, and return three results: ERROR, NOT or PREGNANT. It turns out that $50 and getting at least one pregnant woman to pee on a test strip can end up for an en- tertaining couple of evenings at the old workbench.



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