Co-founders Vienna Sparks and Skye Lam met in high school, and during college the pair lost a friend to overdose. It’s a story that, sadly, many people (including myself) can identify with. Thankfully, testing strips are a common sight now at venues and health centers, with hundreds of millions shipping yearly.

If you haven’t seen them, the strips work like this: You dissolve a bit of the substance to be tested in a provided buffer solution, then dip the strip in. The liquid travels up the paper, reaching a treated area that changes color in the presence of an unwanted additive. They’re simple and effective, but limited in that they only detect one thing, most commonly fentanyl.