This a Motorola radio and he indicates that he is not transmitting when it trips the device. Normally he places his radio on the dresser and the GFCI in the adjacent bathroom actually trips. Approx. 18" away directly line, but on the other side of an interior wall. The second GFCI is located in the "mud room" and it occassionally trips when he sits down to remove his shoes. Weird things happen all the time.
This is very interesting. Some questions....
Is he the only one at the station that has this issue, or are others experiencing the same thing?
If it is just him, could he change radios? It may be a defect in the radio that Motorola would be interested in knowing about.
As for the mud room, he may be accidentally pushing the PTT when he sits down. But the anomaly is when the radio is not even being touched it acts like it is transmitting.
If you can narrow the problem down to the radio, it may be intermittently transmitting dirty spurious signals as the result of an internal electronic failure of some sort. Also, if this is the only radio with the issue, the issue may be a precursor to a total failure down the road. That's an even better reason to get a different radio than the nuisance GFCI tripping.