Thomas Demint's voice is heard only briefly on the eight-minute video he took of police officers arresting two of his friends, and body-slamming their mother. I'm videotaping this, sir," he tells an officer. After he stopped recording, Demint says three officers tackled him, took away his smartphone and then tried, unsuccessfully, to erase the video. They then arrested him on charges of obstruction of governmental administration and resisting arrest. Demint is part of a growing trend of citizen videographers getting arrested after trying to record police behavior. "By all accounts the situation has gotten worse," said Chris Dunn ... of the New York Civil Liberties Union. "People are more inclined to pull out their phones and record, but that is often met with a very bad response from police." What makes the situation hard to define ... is that no one is ever arrested on a charge of recording police because that has widely been upheld as protected under the First Amendment. Instead, they are being hauled into court on obstruction, resisting arrest or other charges. Jonathan Turley, a law professor at George Washington University, said the right to take videos of police encounters in public is clearly protected by the First Amendment. He said the trend is for police to detain people who are shooting video, and subsequently drop the charges. "State and federal courts ... have made it abundantly clear that citizens have right to film police in public," he said. "Police are ignoring this clear precedent and continue to threaten citizens."