The idea that nobody has thought to do them seems absurd. I'm getting more and more suspicious the longer we see no results from randomized studies in US cities

The idea that nobody has thought to do them seems absurd. I'm getting more and more suspicious the longer we see no results from randomized studies in US cities - it's getting more and more likely that either the tests are turning out to be inaccurate, or the results are turning out to be problematic. But either way folks are probably being very careful because the results will have significant impact.