Amy Goodman, host of the New York City-based leftist news programme Democracy Now! was charged with criminal trespass by the North Dakota state's attorney (prosecutor). The charge was changed to riot, then was dismissed due to lack of evidence when Goodman appeared in court on Monday. The charges stemmed from her presence at a protest in September against construction of the Dakota Access (Bakken) oil pipeline, after the protest was reported on her show.
I didn't write the summary properly. What I meant to write at the end was that the initial charge was filed several days after the protest, after Goodman had broadcast a report about it. She wasn't arrested during the protest. I assume that she went back to the New York City area, where the show is produced, then made an additional trip to North Dakota to appear in court.