According to a University of Pennsylvania 16 page research document titled "Why (Special Agent) Johnny (Still) Can't Encrypt" reported on by The Register, the $25 GirlTECH IM-me toy can be easily reprogramed to knock out P25 radio transmissions to the extent of excluding specific subnets and users. Other simple devices were used to  track specific users, and knock out encryption keys. Over a few months the researchers were able to easily hear plans for upcoming arrests, names and locations of criminals under investigation, and details of surveillance operations.

The researchers concluded that the P25 system isn’t designed with a properly layered security model.

Some mods for this device can be found here.