I read another story saying he read a russian hacker website that described how to broadcast high pitched tones on the control frequencies of the trunked system, thereby the Motorola controller would lose control of all the channels......Normally you would need a radio that was programmed as part of the system to get on the air at all...and if you had a lost one and started messing around, the system could lock out that radio. Apparently there is a work around. Of course, if this guy could research it, I am sure others could to.
Can you imagine the next 9/11 inquisition...instead of families screaming about inoperable radios that couldnt talk to each other.....you have communications brought down by hackers as a second part of the attack. With the internet you could probably do that remotely too.
It's time to revert back to tin cans and string for unhackable communications!