Someone from Roadfood is being quoted in the news:
"I wish the police around the country would get the memo on these situations," said Jane Kirtley, professor of media ethics and media law at the University of Minnesota. "Somebody needs to explain to them that under U.S. law, making video recordings of something that's happening in public is legal."
The courts have been "pretty clear" on the issue, Kirtley said. "Law enforcement has no expectation of privacy when they are carrying out public duties in a public place." http://www.twincities.com/localnews/ci_22333563/little-canada-man-videotaped-sheriffs-deputies-and-got