From DC Chamber of Commerce:

The swift transition to telehealth in the region, for example, was the result of temporary deregulation, including allowing out-of-state medical professionals to provide telemedical services.30

30 Philip A. Wallach and Shoshana Weissmann, “Taking Stock of COVID-19 Deregulation” (Washington, DC, 2020), https://www.brookings.edu/research/taking-stockof-covid-19-deregulation/.