You may be familiar with the new over-the-counter breath tests that have recently become available in drug stores and gas stations in North Carolina. The tests are simple, small, and extremely cheap—you can find them at many local gas stations for just five dollars.

When these tests first became available, it seemed like they might quickly become a party staple, like a gift bag at a child’s birthday party. While the tests haven’t quite gotten to that level—they’re not exactly a craze just yet—they are important gadgets with serious potential to completely change [...]