I acquired a ham radio license in 1976 while attending graduate school at SDSU. An elderly rancher (WB6DSP) was selling a nice 2-meter rig and was in the hospital nearby SDSU. I purchased the rig from him so he would have the funds necessary to buy an even nicer radio. He mentioned the problem with illegals trespassing on his property at that point in time (near Campo).
In 1979, my company sent me to the home of a fisherman to install a new marine HF SSB radio so his wife could communicate with the boat. She was lamenting all the damage done to their property by illegals. That home was located on a "truck trail" off 94 beyond Dulzura.
The south and east county rural residents have been fighting the illegal problems for over 30 years. Many of the brush fires in that area are started by illegals. Sometimes it is accidental. Sometimes it is with the express intent to do harm to the people who own and live on the property in that area.</p.