Since the first documented use of an LRAD sound cannon on protesters by Pittsburgh Police during the 2009 G20 summit, LRAD use by police against activists appears to be on the rise. The Pittsburgh Police Bureau used it again in 2011 during the Super Bowl, the New York Police Department has used it several times including the Eric Garner protests and during Occupy, the Oakland Police Department also used it against Occupy protesters, and more recently and perhaps most prominently, an LRAD was deployed during the Ferguson unrest and the Standing Rock protests.