One of the things that I’ve noticed in this case is that people often present theories in the form of a question. It is almost always something like "Could Zodiac…" So I did a search on that phrase, and found a small few:
Could Zodiac have moved?
Could Zodiac have been a car dealer?
Could Zodiac have been an astronaut?
Could Zodiac have been the father?
Could Zodiac have actually placed this call as well?
Could Zodiac have a multiple personality disorder?
Could Zodiac have been a student at Healds college?
Could Zodiac have been referring to this plane crash site?
Could Zodiac have worn pink glass slippers like Cinderella?
Could Zodiac have had a female lick the stamp or envelope?
Could Zodiac have known Fouke & Zelms didn’t come forward?
Could Zodiac have known at least about the testing of Saliva?
Could Zodiac have decided to halt his crimes of his own accord?
Could Zodiac have it in for that Bates, and killed the wrong person?
Could Zodiac possibly have been someone in the construction field?
Could Zodiac have been 5’9" 165lb., using padding around the middle?
Could Zodiac have had enough time in the cab, in the dark, to be so precise?
Could Zodiac have actually said he just broke out of Muskegon, not Montana?
Could Zodiac have been working here on one of the refits or upgrades in 1963?
Could Zodiac be intelligent enough to have learned about the discovery of DNA early on?
Could Zodiac, the Black Dahlia killer and Chicago’s ‘lipstick murderer’ all be the same man?
Could Zodiac’s use of the "Red Phantom" name and Marin postmark be a simple coincidence?
Could Zodiac still be out there, biding his time, waiting for the perfect opportunity to strike again?
Could Zodiac have known these victims not personally but as a acquaintance of someone he knew?
Could Zodiac’s round, bloated face be indicative of fluid retention from a developing health problem?
Could Zodiac have been inspired by the Texarkana murderer, and added his own pseudo-occult overtones?
Could Zodiac have been a member of the Canadian Navy, relocated to the bay area for some consulting work?
Could Zodiac have had upside down versions of other letters to choose from and merely opted not to because they just didn’t look right?
Could Zodiac have not felt rage toward the lover’s at lover’s lanes anymore after finally finding a female he could be sexually active with?
Could Zodiac have picked that location in Presidio Heights because he could go somewhere safe to watch the aftermath of his crime unfold?
Could Zodiac have been referring to the higher elevations of THE SIERRAS-mountain range considering the higher elevation road PASSES, if I’m not mistaken on that?
Could Zodiac have been a guy from Donna’s hometown who Donna rejected him and was in trouble out in the Dakotas perhaps spending time at that prison up in Montana eventually working his way out to California?
Could Zodiac have known that the Eight year old saw him and could identify him and that’s why he sent what appeared to everyone else to be a random threat to kill school children because it was, in fact, directed at the Eight year old that he knew had seen him that night?
Wouldn’t the answer to any or all of these be "yes, maybe it is possible?"
-glurk
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I don’t believe in monsters.
A related idea is the "rule of thumb" you should apply when reading news headlines that end in a question mark.
In most situations, the real answer to those questions is "No."
Wow…that sure puts the whole "could he have" question in perspective.
He could have done a lot of things, so what’s the point of asking that?!
“…they may be dealing with one or more ersatz Zodiacs–other psychotics eager to get into the act, or perhaps even other murderers eager to lay their crimes at the real Zodiac’s doorstep.“ L.A. Times, 1969
A few more to add to the list:
Could the Zodiac have murdered Elizabeth Ernstein?
Could the Zodiac be using pig Latin to develop his ciphers?
Could the Zodiac possibly have tried to mask bigrams visually with the "+" symbol etc?
Could the Zodiac have known about [Dirty Harry] and the filming locations prior to the Zodiac sending out the Phillip’s 66 map?
Could the Zodiac be wearing a wig?
Got a chuckle out of this thread. 
There is more than one way to lose your life to a killer
http://www.zodiackillersite.com/
http://zodiackillersite.blogspot.com/
https://twitter.com/Morf13ZKS
I think there is one more question that everyone needs to ask themselves. "Could the Zodiac have been MY step-father?"
A related idea is the "rule of thumb" you should apply when reading news headlines that end in a question mark.
In most situations, the real answer to those questions is "No."
Could Zodiac have known this?
Could the Zodiac know that in the future people would discuss it, so the term" slaves for the afterlife" 
https://zodiacode1933.blogspot.com/
Zodiac could
After all, he’s the anti-Norris
Some rude stuff here. You don’t know whether or not he could have murdered Elizabeth. If he did, would you feel very emberassed?
Goodbye site. Enjoy figuring things out without locals or people who might just be able to help with something even if we seem like idiots.
The snark is unbelievable.
Some rude stuff here. You don’t know whether or not he could have murdered Elizabeth. If he did, would you feel very emberassed?
Goodbye site. Enjoy figuring things out without locals or people who might just be able to help with something even if we seem like idiots.
The snark is unbelievable.
In fact, does not allow digressions is to limit the possibilities actually much people have taken the case as if it were his domain (as if it had any relevance), and some even survive that, and everything is simple, clear that every question will be answered, "yes, no and maybe," In a few years we all will be dead and the questions are the same, or maybe not, anyway never know.
Marcelo
https://zodiacode1933.blogspot.com/
Hey PinkPhantom,
Are you alright? I hope I didn’t say anything wrong?
Hey PinkPhantom,
Are you alright? I hope I didn’t say anything wrong?
I believe it was not you Mr Jarlve (on the contrary you do a job admirably and has this posture educated), but with all that that involves these plates Z, say, it all comes down to that 10 or 12 people think, leaving ideas or aborting the same in their beginnings. Yes of course, it is clear that such person has high knowledge on the subject, and which are democratically refute or agree to things, but of course, within the civility least without behaving like "young" "veterans" of colleges , besides social networks allow anyone is friend and exchange ideas, unlike the forums in which we need not be friends.
Mr. Pinkphanton, please remain on the forums
Marcelo
https://zodiacode1933.blogspot.com/
Most research questions and scientific theories begin with questions like:"Could this be because of…"
If this thread was intended to make fun of people spending their time in trying to get some answers in this case, I dont like it.
I agree with Pink Phantom…
I am just glad people are still interested in trying to solve this case. Doing their best to keep this case alive.
If a forum doesn’t take the visitors (who take the time to write about new things or react on others) serious than such a forum isn’t a good place for asking response on what you are researching. It makes researchers feel unsafe to post what they discover.
People got bashed in the past on public Z-forums because they posted a theory that wasn’t mainstream or didn’t fit in the views of the other readers. I saw a lot of good and smart researchers (who had the best intentions to solve this case for the victims) got hurt and leaving this case because of this.
Apparently, many people seem to have completely misunderstood my original post, although I thought that I wrote it very clearly.
(At least Tahoe27 seems to have understood my meaning.)
It was not meant to be funny, snarky, or even as a comment on the validity or lack or validity of theories. NOT. MY. POINT. AT ALL.
See, I am a computer programmer and am very literal. I just tend to think that way. So when I see a question from someone, in the specific form of "COULD ZODIAC HAVE X" where "X" is something that he very well could have done, it just strikes me as a poorly written question.
Examples – "Could Zodiac have a scar on his chest?" "Could Zodiac have read this particular book?" "Could Zodiac have been a wrestler?"
Clearly, the answer to ANY of these is "yes, maybe so." It just seems odd to me to pose a question like that. I am talking about the SPECIFIC syntax of that form of question. No one here can possibly answer a question like that, only Zodiac could.
As Tahoe27 said – "He could have done a lot of things, so what’s the point of asking that?!"
I was not intending to be judgmental of anyone, and the list of questions in my original post came from searching Google for "could zodiac" questions, and they came from all over the internet, from forums, blogs, various sites, etc… They are all direct quotes.
As Eduard says above:
Most research questions and scientific theories begin with questions like: "Could this be because of…"
This I agree with. But saying "Could this be because of X" is quite different from asking "Could Zodiac have done X."
Maybe the distinction is subtle, but it seems clear to me. The former question can be researched and possibly answered, the latter not so much. That’s what I was talking about. Just as in programming, to get the right answers, you have to start with the right questions.
-glurk
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I don’t believe in monsters.
