11 A free-standing acoustic device A free-standing acoustic device A vehicle-mounted acoustic device indiscriminate, as they cannot be used to target a particular person without also affecting others in close proximity,13 and because the health implications are unpredictable, as individual sensitivity to sound exposure varies greatly.14 13 14 Symons, M. & Humphrey, I., “Long Range Acoustic Communication: LRAD Evaluation”, Home Office Scientific Development Branch, Home Office Policing and Crime Reduction Group, January 2006, p.30, referenced in Ontario Ministry of Community Safety and Correctional Services, Review of Police Use of Long-Range Acoustic Devices, November 2011, <http://files.ctctcdn.com/b2ecfcdb001/ d6bf0774-6e41-433f-a5a3-29a0edb71193.pdf>. Ibid.