As many of you are aware, Tom Voigt has a podcast called "Murder Basement" which I think it excellent. Very detailed and very impartial. I've listened to everyone.
However, I was recently listening to the episode entitled "Dispatching Zodiac" which focused on Nancy Slover.
I've listened twice to the podcast to make sure I was hearing it right, but towards the end of the episode Tom reveals that the operator that took the Zodiac's call was "Mrs. Johnson", and that Betty Main was her supervisor who authorized the call trace. He says this is revealed in "secret Vallejo police reports".
Does this mean that these "secret reports" have never been released to the public?
Because in the police reports available online, "Mrs. Johnson" only appears as the operator who calls the police and informs them the location of the trace. The trace was initiated by Betty Main. Mrs. Main is never described as Mrs. Johnson's supervisor. In fact, the only supervisor mentioned is Betty's - who would not allow Betty to speak to the police.
So, if my reading comprehension is accurate, it was likely Betty who spoke with Zodiac and initiated a trace, and who wasn't allowed to talk to police by her supervisor. Mrs. Johnson, it seems, was merely the operator who was tasked with calling and informing police.
I'm not disputing Tom's account, but it is confusing in light of publicly available info. Can anyone - especially Tom - offer any insight?

