dave salm: but they're called geo-fences., around where i live. i put a geo-fence around the sheriff's department. keith morrison (voiceover): protection he felt he needed after someone targeted law enforcement with those spikes on the road. dave salm: if the vehicle or the gps monitor travels into those locations, you get an alert. keith morrison (voiceover): in addition, detective salm would routinely log in to check on the whereabouts of peter and paul's trucks. and on the morning of thanksgiving day, more than four months after the bombing, salm turned on his computer to find the gps tracker on paul moore's truck-- dave salm: had gone dead, we had no signal whatsoever. and this is also the type of gps that you could call, just like calling on a cell phone, and wake it up because they go to sleep when they're not moving. and where are you? well, we couldn't get a response from it. keith morrison (voiceover): the device may have just died or been found, so salm got into his car with his partner, drove to paul's house to see

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