Last February I questioned the Australian Federal Police about the use of Long range Acoustic Devices (LRAD) at the Convoy to Canberra protests and the response has been delivered.

The AFP confirmed the presence and use of LRADs (as loud speakers) at the protest, but deny they caused any injuries.

I have published in full the questions I put, and the answers I received, at the link below:-

LRAD AFP Questions and Answers