Dallas police officers, including the union that represents them, are asking citizens organized to keep watch over cops with recording devices to stop filming law enforcement because it is causing unspecified “major safety issue[s].”

In late 2012, the US Supreme Court upheld a citizen’s right to record police officers performing their official duties.

Thus, some Dallas officers have been notified by “an email,” according to CBS-DFW, that citizens are acting lawfully by filming police action.