Enlarge / Senator Ron Wyden as seen February 7, 2018 in Washington, DC. (credit: Chip Somodevilla/Getty Images)

In a new letter submitted Tuesday morning to the head of the Federal Communications Commission, Ajit Pai, Sen. Wyden submitted a slew of new questions concerning how these controversial devices interact with the 911 emergency system. His inquiries come on the heels of efforts last month to scrutinize what the Department of Justice knows about the secretive use of these devices.

In addition, Wyden got a new amendment into an appropriations bill that was approved by the Senate on Monday evening. The amendment requires the Department of Defense to notify the Armed Services Committee about all stingrays detected near military bases during the previous three years and to describe what actions the Department has taken to protect service members and their families against hostile stingrays.