Records released last week show D.C. Metropolitan Police Department employed a Long Range Acoustic Device during the Women’s March to “direct the crowd flow.” This is the latest evidence of an worrying trend in which police departments are increasingly using the incredibly powerful LRAD to deal with non-violent protests at the risk of causing permanent hearing loss.

Attend any of the protests over inauguration weekend? Wondering if your phone was surveilled doing so? Unfortunately, with law enforcement’s continued silence about cell site simulators use, it’s almost impossible to know.