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Date published: June 12, 2020""It is something that launched and then sort of fell away," said Ryan Calo, a University of Washington law professor and expert in tech policy and privacy who was an early skeptic that the apps could be effective. He said it makes sense for states to focus on human contact tracers, who "have been effective since the bubonic plague." Read more about Coronavirus contact tracing apps were tech's chance to step up. They haven't.NBC News