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Once you have called in a complaint of a suspect it is official police business. If they tell you to stay with your car they mean it or they would not tell you to do so. No one asked GZ to follow, he knew full well he was not suppose to because he set up the NW Program himself. He knew what to do and disregarded the very rules of the program. He knew it was dangerous to follow someone he had already decided was a suspect. Whatever was his motivation???? His car was parked in front of a home that faced the street with a house number on it but he ignored LE's request to return to his car and kept walking to the next street (according to his Dad).
LE can't do their job with people who take it upon themselves to interfer. And once that call is placed it is official police business your obligation ends. All LE did was ask if he wanted to meet the cruiser and where would he be. He never said I'm planning on continued to follow this dude. He owed LE the consideration as a private citizen to do as they had asked him to do. Go back to your car, you don't need to follow, we have a car on the way, please meet us at the mailboxes, etc. on and on. It's all pretty clear.
If everyone decided to take matter into their own hands it would be a lawless society. Two things that put LE at a disadvantage. GZ did not tell them he fully intended to keep following TM and that he was armed with a gun. Two very important facts that LE should have been aware of.
Once you call it in to LE, let them do their job, please. GZ owed TM that consideration. Now TM is dead and it did not have to turn out that way. jmo