A court-recorded case shows that Cho Doo-soon damaged the external antenna of his home electronic monitoring device in Ansan on June 3 last year. The indictment and judgment materials say he broke it after believing the antenna was sending radio waves into his brain.
The deviceโs LTE signal strength fell sharply after the damage, but the probation office identified the tampering only six days later. The delay has raised questions about how quickly damage to home monitoring equipment is detected.