I'm wondering if decentralized DIY testing can arise from centralized, vetted plans giving skilled tradespeople enough information to construct, calibrate and v

I'm wondering if decentralized DIY testing can arise from centralized, vetted plans giving skilled tradespeople enough information to construct, calibrate and validate their own tests. And if enough can be made to reasonably rule out false negatives before positives are sent onwards to "official" testing, and lessening the inevitable load on hospitals, and in these early days of testing, the testing facilities. Everything I've read so far doesn't seem to say "first, you need a <fission-reactor-scale-dooodad>". So I'm wondering how feasible it is, and the deeper I dig into this, the more I'm wondering just how low the bar goes.