Again he was not privy to the police officers claims or statements prior to November 9th 1969, so it was either a lucky guess on his part or he was telling the truth.
It is easy for the police and newspapers to discredit the Zodiac Killer, simply by saying 'they are the claims of a madman' or 'psychopath'. They claim in no way did the Zodiac speak to the police officers that night, nor did he likely enter the park on account of the sniffer dogs employed in the search, but this may simply not be the case. His claim above of talking to police officers is likely true, as the timeline suggests and unless Pelissetti was lying and I see no reason why he should, it places Fouke in a direct path with the killer at 9.57 pm that night and how would the Zodiac know of Donald Fouke's route that night, that ties in perfectly. The embarrassment of questioning a suspect and then letting him on his way, may have been something that would be better glossed over and something the Zodiac was keen to highlight in the Bus Bomb Letter, insisting it must be printed in the newspapers. In other words he wanted to highlight this fact, something that had clearly been kept under wraps. But if this were the truth, how many other of the Zodiac claims were true, let's take a look.
This is what the Zodiac said in the Bus Bomb Letter "I gave the cops som bussy work to do to keep them happy. I enjoy needling the blue pigs. Hey blue pig I was in the park -- you were useing fire trucks to mask the sound of your cruzeing prowl cars. The dogs never came with in 2 blocks of me + they were to the west + there was only 2 groups of parking about 10 min apart then the motor cicles went by about 150 ft away going from south to north west."
The Zodiac again backs up the idea he entered the park via Spruce Street saying "The dogs never came with in 2 blocks of me + they were to the west." This suggests if we travel just over two blocks west of the Spruce Street entrance to the park, this is where he was observing the police, fire trucks, motorcycles and dogs from. See here. The Arguello Boulevard entrance to the park is just over two blocks.
They were going from south to north west.
So what road was the Zodiac describing from his vantage point, allowing him to view this directional movement of traffic.
There was elevation in the park, but his view would also have been masked by trees. This display on Google Maps shows part of the Arguello Boulevard masked by trees, but a little further on it opens up. This section of Arguello Boulevard frees itself from the tree line and heads from south to north west just as the Zodiac stated on the Bus Bomb Letter. So all that is left for us to do is pinpoint his location, allowing him to clearly view this area. The police would certainly have focused on this area, as it was not only a key entrance to the park but also an area of dense growth, availing many possibilities to escape into. So lets travel back to the entrance to the park from Spruce Street.
Knowing of the commotion to the west, logically the Zodiac should have accessed cover immediately to the east after entering the park, somewhere in the region shown below. Note now the line of sight available to the Zodiac to that portion of Arguello Boulevard we mentioned earlier, running northwest and we may just have as near an exact position of the Zodiac Killer on October 11th 1969 in the park, as we may ever have.
It may well be the case that if the Zodiac didn't have a car waiting somewhere by the intersection of Jackson and Maple, for fear of vehicle identification, then his claim of entering the park might well be true after all. After viewing the police to the west, including any scent dogs, he may have cut his losses. He couldn't head west, he surely wouldn't have re-entered West Pacific Avenue or Jackson Street, the sensible option appears to head eastwards toward Cow Hollow or the Marina District, but bearing in mind he may have been covered in blood, is it possible he lived in a house backing onto the park or more likely had his vehicle parked here, affording him a distinct separation from the Presidio Heights area. Or was the Zodiac Killer a liar and was never in the park. I'm not so sure anymore.