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".
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 appeared Officer Pierre Bidou responded pretty quickly to the crime scene and was one of first responding officers at the Lake Herman Road turnout. But there is one very big problem when we look at the timeline of Frank Gasser, Robert Connelly, Peggy and Homer Your, Stella Borges (Medeiros) and James Owen.
Pierre Bidou stated he passed the turnout on the way to the Benicia Police Department, his headlights illuminating 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 received the dispatcher's call of a possible incident on Lake Herman Road. Pierre Bidou, by all accounts, had to have passed the Lake Herman Road turnout before the murders, yet how can 8 or even 10 minutes later, a possible double murder have been reported? The timeline of the above eyewitnesses span approximately 15-20 minutes. In other words, after Pierre Bidou had passed the turnout seeing no vehicles, David Faraday and Betty Lou Jensen would need to park up in their Rambler, then have been spotted by six eyewitnesses over a period of 15-20 minutes before and after the murders, followed by Stella Borges racing off to notify Captain Daniel Pitta a further 3 to 4 minutes later. He was the first officer to have been informed of the crime. This means that 18 to 23 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 just 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.
Who sent this "crank call"? It certainly sounds from reading between the lines, that this wasn't an official police radio dispatch relayed from Captain Daniel Pitta. Could it have been an early Zodiac phone call? The only other two people to have known about the Lake Herman Road crime scene at approximately 11:18-11:23 pm were Stella Borges and Captain Daniel Pitta. Additionally, if Captain Daniel Pitta had called in the crime, it would have been an official radio message, not a crank call - possibly 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 Killer himself had called it in.
Finally, in the True Crime video with Aphrodite Jones (2010) https://youtu.be/TFp9s3cwkms?t=11m9s Pierre Bidou twice mentioned David Faraday being inside the Rambler, at 11:17 and 11:45 into the video. He stated "The young man was still in the car" and "you see the male in the car still breathing". In the https://beniciaherald.wordpress.com/the-zodiac-case/ article, it stated "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." Additionally, on the 'Richard Gaikowski -The Case of the Zodiac Killer' video, we get a further example at 13:22, where Pierre Bidou stated "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.