Investigators discovered two sets of bloody fingerprints on the taxicab of Paul Stine, murdered at the intersection of Washington and Cherry Streets in Presidio Heights on October 11th 1969. The first set of prints were discovered on the dividing panel between the driver side of the taxicab and left rear passenger door. The second set of prints were discovered on the outside handle of the right front passenger door of the taxicab. Both these sets of prints were circled in red in the police report. The following excerpt from the FBI files details the findings. It clearly states that "The latent prints that show traces of blood are believed to be prints of the suspect". Since the prints from the right front door handle were believed to be prints from the killer, it's fairly obvious that they showed traces of blood. This is why they were circled with a red pen.
If the Zodiac Killer rode in the front passenger seat of the taxicab that night and executed Paul Stine, he most certainly would have received some back spatter to his hand and gun. He may also have transferred blood to his hands in the process of removing a piece of Paul Stine's shirt. If this was the case, why was no blood found on the inner door handle, yet was discovered on the outer door handle? The killer had every reason to touch the inner door handle to leave, so may have used a handkerchief to avoid getting fingerprints on this handle. However, upon exiting the front passenger door, there was absolutely no need to ever touch the outer door handle with your fingertips to close it. Just close it by pushing the door with any other part of your body (leg, foot, lower arm, elbow, shoulder, or using the handkerchief). Despite the three teenagers having described the Zodiac Killer wiping down the front passenger door with a handkerchief, it is apparent that he still left bloody prints.
A killer traveling in the back seat would also have received back spatter on his hand and gun, but no blood was recorded being found on the inner back passenger door handle. The murderer would then have exited the right rear door and entered the front passenger door. The question would now be: did the killer successfully avoid (or even attempt to avoid) placing his fingerprints on the front outer door handle as he entered the front compartment? Bloody fingerprints were retrieved from this handle, so it's possible the answer was no (he could always attempt to clean the handle upon leaving, as noticed by the three teenagers). The killer managed to avoid depositing bloody fingerprints on the inner and outer door handle at the rear. He also avoided depositing bloody fingerprints on the front inner door handle. The only door handle to contain the killer's bloody fingerprints was the outside of the front passenger side. A handle that a front passenger never needed to close with a bloody hand, but a handle that a back passenger certainly needed to open when entering the front of the taxicab.
A killer traveling in the back seat would also have received back spatter on his hand and gun, but no blood was recorded being found on the inner back passenger door handle. The murderer would then have exited the right rear door and entered the front passenger door. The question would now be: did the killer successfully avoid (or even attempt to avoid) placing his fingerprints on the front outer door handle as he entered the front compartment? Bloody fingerprints were retrieved from this handle, so it's possible the answer was no (he could always attempt to clean the handle upon leaving, as noticed by the three teenagers). The killer managed to avoid depositing bloody fingerprints on the inner and outer door handle at the rear. He also avoided depositing bloody fingerprints on the front inner door handle. The only door handle to contain the killer's bloody fingerprints was the outside of the front passenger side. A handle that a front passenger never needed to close with a bloody hand, but a handle that a back passenger certainly needed to open when entering the front of the taxicab.
If the Zodiac Killer entered the front passenger door at the beginning of the journey, then it's possible he deposited a normal fingerprint on the outer door handle that required wiping away after the murder. However, a wiping motion with your fingerprints protected by a handkerchief, would be extremely unlikely to deposit any bloody prints. But if bloody prints were already on the handle, caused by a back seat passenger entering the front compartment, wiping them down upon leaving could fail to remove all of them. There will always be the claim that these fingerprints were deposited by responding personnel, despite the fact that this was a managed crime scene, with the option of elimination prints at a later date. This claim is usually trotted out by researchers with a vested interest in a particular suspect, who they don't want ruled out by bloody fingerprints. Rather than rip up years of research, it is much easier to rip up the evidence. The balance of probability in the Paul Stine murder leans toward a Zodiac Killer who rode in the back of the taxicab that night, although like most things in the Zodiac case, there is always room for doubt.
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