From Hussein v. County of St. Louis (E.D. Mo. Aug. 15, 2014):

Parties acknowledge and agree that the media and members of the public have a right to record public events without abridgement unless it obstructs the activity or threatens the safety of others, or physically interferes with the ability of law enforcement officers to perform their duties.

The ACLU of Missouri, which represented plaintiff, reports that “[t]his action was prompted when videographers were commanded to turn off their video cameras Wednesday evening at a gathering of protesters.”