Davis man who killed rookie cop left note saying he was hit with ‘sonic waves’

Suspect In Davis Officer’s Killing Identified As Kevin Douglas Limbaugh, 48

https://m.sfgate.com/bayarea/article/Davis-man-48-identified-as-shooter-in-slaying-13529125.php

The Davis Police department has been hitting me with ultra sonic waves meant to keep dogs from barking,” read the note, which was typed on a computer. “I notified the press, internal affairs, and even the FBI about it. I am highly sensitive to its affect (sic) on my inner ear. I did my best to appease them, but they have continued for years and I can’t live this way anymore.”