> I've never heard of a non licensed profession being barred from "practicing"
Kevin Mitnick.
From the Wikipedia article about him:
> He was released on January 21, 2000. During his supervised release, which ended on January 21, 2003, he was initially forbidden to use any communications technology other than a landline telephone. Mitnick fought this decision in court, eventually winning a ruling in his favor, allowing him to access the Internet. Under the plea deal, Mitnick was also prohibited from profiting from films or books based on his criminal activity for seven years, under a special judicial Son of Sam law variation.
> In December 2002, an FCC Judge ruled that Mitnick was sufficiently rehabilitated to possess a federally issued amateur radio license. Mitnick now runs Mitnick Security Consulting LLC, a computer security consultancy and is part owner of KnowBe4, provider of an integrated platform for security awareness training and simulated phishing testing.
https://en.wikipedia.org/wiki/Kevin_Mitnick