In July 2019, the ACLU of Hawai‘i learned that the state purchased a long-range acoustic device ("LRAD") to use at the Thirty Meter Telescope ("TMT") demonstrations on Mauna Kea. LRADs are military-oriented weapons commonly referred to as a "sound cannon." 

With concerns over the LRAD's possible "chilling effect" on the public, we wrote a demand letter to the state asking them to reassure the public that the LRAD would not be used. 

Read the letter below.