That will not be permitted. That would make those doctors 'wreckers' in commie parlance. 'Wreckers' go to the gulags.
To practice, you must be extensively credentialed by Federal and State bureaucracies.
To prescribe, the Feds must issue you a DEA #.
How difficult is it to do a computer crosscheck and find the names of the renegades who practice and prescribe, but whose names are not on the list of those approved to do so by the licensing agencies?