AKA nothing. As the article mentions, a warrant goes into detail about how the vans function: https://www.whatdotheyknow.com/request/statements_involving_tv_det

AKA nothing. As the article mentions, a warrant goes into detail about how the vans function: https://www.whatdotheyknow.com/request/statements_involving_tv_detector https://www.whatdotheyknow.com/request/statements_involving_... The idea they're empty and "just to scare people" is a myth. They are functioning devices.