In the Benicia Herald online this is confirmed "Bidou and his partner had served a warrant on a Lake Herman Road cabin Dec 20th 1968 and were on their way to deposit some marijuana in the police department's evidence locker when they were dispatched back to Lake Herman Road." http://beniciaheraldonline.com/citizens-police-academy-signs-of-the-zodiac/
In True Crime with Aphrodite Jones (2010) he states at 11:58 into the video "And you can see she is dead and the bloods still fresh, her heart was still pumping the blood out when we got here." By all accounts it appears Pierre Bidou responded pretty quickly to the crime scene and was one of earliest officers at the murder site. But there is one very big problem when we look at the timeline of Frank Gasser, Robert Connelly, Peggy and Homer Your, Stella Borges and James Owen.
Pierre Bidou stated he passed the turnout on the way to Benicia Police Department, his headlights illuminated the turnout and nobody was observed. It takes approximately 8 minutes to arrive at the Benicia Police Department from this location traveling at 30 mph, at which point he receives the dispatcher's call of a possible murder. Pierre Bidou had to have passed the scene before the murders, but how can 8 minutes later or even 10 minutes later a possible double murder have been reported. The timeline of the above witnesses is 15 minutes. In other words after Pierre Bidou had passed the turnout David Faraday and Betty Lou Jensen would have had to park up, been spotted by six eyewitnesses over a period of 15 minutes, Zodiac would have pulled up and killed them both and Stella Borges then would have raced off to notify Officer Daniel Pitta a further 3 to 4 minutes later, meaning he was the first officer to have been told of the crime. This means 18 to 19 minutes had elapsed from the first eyewitnesses spotting David Faraday's Rambler to the reporting of the crime to Officer Daniel Pitta, so how could Pierre Bidou have been notified as he pulled into the Benicia Police Department 8 to 10 minutes later after passing an empty turnout and stating "We had left and were heading back to the police department to put the marijuana into evidence and as we drove by we didn't see or observe anybody in that area." There is simply not enough time for all these eyewitnesses to have observed and done what they said they did and for both David Faraday and Betty Lou Jensen to have been killed in approximately 8 minutes.
Furthermore considering the slender timeline, if Pierre Bidou had passed the turnout and spotted nothing, for the Zodiac to have entered the turnout shortly after David Faraday and Betty Lou Jensen had arrived, committed the crime and left without being seen would suggest he not only arrived from the Vallejo area but had returned that way afterwards, any other scenario would have him passing Pierre Bidou as he was traveling towards Benicia and this was not mentioned by Pierre Bidou. However had the Zodiac chosen to turn left and head towards Vallejo after the murders, he would have passed Stella Borges along Lake Herman Road. She reported passing no other vehicles. Again the timeline breaks down.
Initially, they were told a woman was lying outside a car; they thought they were being sent to a crash. Police at first speculated it might have been a crank call, but the officers headed back north.
But when they arrived, Bidou realized it was no crank call and no car accident. Instead, it was a sinister crime scene"
Who sent this 'crank call', it certainly sounds from reading between the lines that this wasn't an official dispatch message relayed from Officer Daniel Pitta, could it have been an early Zodiac phone call, not likely, but the only other people to have known about the Lake Herman Road crime scene at around 11.20 pm was Stella Borges and Officer Daniel Pitta, but if he had called in the crime, it would have been an official message not a crank call, indicating a third party was aware of the scene at Lake Herman Road. So either somebody else of innocent persuasion had also passed the scene near to the timeline of Stella Borges or the Zodiac himself had called it in.
Finally in the True Crime video with Aphrodite Jones (2010) https://youtu.be/TFp9s3cwkms?t=11m9s Pierre Bidou twice mentions David Faraday being inside the car, at 11:17 and 11:45 into the video he states "The young man was still in the car" and "you see the male in the car still breathing" and in the https://beniciaherald.wordpress.com/the-zodiac-case/ article it states "Inside the car, the officers found a boy in the passenger’s seat who appeared as if “he was trying to get out” of the car. Bidou remembers seeing the shattered glass of the car window, pierced by a bullet. More poignantly, he also remembers that the boy was still breathing." Also on 'Richard Gaikowski-The Case of the Zodiac Killer' video we get a further example at 13:22 where Bidou says "The male was still halfway in the vehicle and he was showing signs of breathing." https://youtu.be/vdVJH1OVk-Q?t=13m22s I suppose we will have to put these four examples down to a slip of the tongue.