I think he is connected with law enforcement and all that anti-cop stuff in his letters is just misdirection.
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The red herrings appeal to me most, also in the EARONS (Jospeph James DeAngelo) case. Zodiac is painting himself as a cop-hating villain who can't even spell words. So, we are supposed to believe in this uneducated cop hater hiding in the shadows with a cloak and dagger. What should we do with that? Find the Zodiac in the opposite as we can with EARONS. You know what? It works! The Zodiac investigation has also looked at cops and the military. So, there is another clue for us.
1. Darlene Ferrin thought the Zodiac was a cop, and so did Mike Mageau. His witness statement includes that Ferrin thought he was a cop. Not some guy she knew or anything like that for this second car encounter. That is why Mageau had his I.D. out. So that's two Zodiac targets, one who survived, who thought Zodiac was a cop.
2. Zodiac used his flashlight to blind Ferrin and Mageau. EARONS also did this. One EARONS target thought she felt a police belt on him.
3. Zodiac understood cut-off techniques.
4. Zodiac understood jurisdictional problems and exploited them.
5. Zodiac understood switching up modus operandi helped him. EARONS did the same.
6. Zodiac ordered Hartnell and Shepard to their knees and went rear just like an arrest. EARONS subdued and tied up also.
7. Zodiac uses terminology in his letters associated with L.E. compliance commands. EARONS also did this verbally.
8. Collecting slaves in the afterlife is documented as a phrase some police officers used if they shot a black person.
9. Zodiac understood ballistic reports, and the first letters are like them.
10. The Zodiac uses ruse words like 'pig' which Joseph James DeAngelo also used as EARONS to misdirect.
11. Zodiac knew fireworks would delay police responses to gunshots. Zodiac knew how to escape mostly without being seen. EARONS also knew his escape routes.
12. Zodiac is forensically aware and understood that saliva on envelope seals could identify blood type even in 1969.
13. Zodiac reports. EARONS asked his targets to report things to law enforcement for him.
14. Zodiac was calm around cops when they showed up and got away.
15. Zodiac seemed to avoid stakeouts at Vallejo. So did VREARONS. It is believed he has inside knowledge and a police radio. Zodiac wrote a letter about how he would never blow up a police station, and then he said in the next letter he would kill a cop. I think he contradicted himself because he thought his sympathy was too revealing.
16. The close groups of spent cartridges indicate that the Zodiac has been trained to take a stance before firing and does not move while shooting. That would be firearms training proficiency even if one victim survived a gunshot attack.
At least some of these points are probably the indicators that investigators were dealing with someone like them. According to The Sacramento Bee, Vallejo police Detective Terry Poyser, who has worked the Zodiac case for four years, seemed to think that there was a possibility the Zodiac was LE and this was in 2019.
That is significant because a law enforcement background is extremely rare among serial killers. You could insert accountant or painter here, and it has the same rarity that stands out. So investigators in 2019 have law enforcement as the Zodiac in their sights.