I don't understand. The article talks about how there is nearly no publicaly available proof that these tests actually work, yet they're selling them in drug st

I don't understand. The article talks about how there is nearly no publicaly available proof that these tests actually work, yet they're selling them in drug stores and hospitals all over the country? And all we know is that supposedly "Theranos' labs have been evaluated and deemed acceptable by drug companies, hospitals that work with them, Walgreens, and others"? Why is this legal?