The Zapruder Film: Questions No One Is Allowed to Ask

Where was the film, and who had access to it?

The single most important question about any piece of evidence is chain of custody: who had it, when, and was there opportunity for alteration? The Zapruder film's chain of custody contains documented gaps that no institution — including the Sixth Floor Museum — has adequately addressed.

What follows is the documented timeline, reconstructed from ARRB depositions, National Archives records, and investigative reporting. Entries flagged in red indicate points where the chain of custody is contested or where CIA involvement has been documented.

What the government's own review board discovered

Douglas Horne served as Chief Analyst for Military Records at the Assassination Records Review Board (ARRB) from 1995 to 1998. The ARRB was created by Congress under the JFK Records Act of 1992 to identify, secure, and make public all records related to the assassination. Horne's work on the Zapruder film is documented in his five-volume work Inside the Assassination Records Review Board (2009).

Horne's key finding: the Zapruder film was processed at two separate NPIC facilities on consecutive nights — and the participants in each event were unaware of the other. Dino Brugioni, who supervised the first event on the night of November 22-23, was shown the briefing boards from the second event decades later and stated he had never seen them before.

• Two NPIC events, two nights: Brugioni's team worked Saturday night (Nov 22-23). McMahon's team worked Sunday night (Nov 24-25). Both created enlargement briefing boards. Neither knew about the other.
• Different film formats: Brugioni worked with an unslit 16mm double-8 film (standard Zapruder format). McMahon received what he described as an already-processed, slit 8mm print — from Hawkeye Works in Rochester.
• CIA classified lab: "Hawkeye Works" was a joint CIA-Kodak facility at Kodak headquarters in Rochester, NY. McMahon stated his film came directly from there, delivered by a Secret Service agent he knew only as "Bill Smith."
• Brugioni's reaction: When shown the McMahon briefing boards years later, Brugioni stated definitively that they were not the ones his team had created. The images differed.

These facts do not prove alteration. What they establish is that the Zapruder film was routed through a CIA classified photo facility within 48 hours of the assassination — and that this routing was compartmentalized even within the CIA's own NPIC. That is not a conspiracy theory. It is the documented finding of the U.S. government's own review board, based on sworn depositions.

Frame-by-frame anomalies identified by physicists and imaging experts

Beyond the chain of custody, multiple researchers have examined the film itself for signs of physical or optical alteration. Their findings are specific, technical, and peer-reviewed within the research community.

• Intersprocket anomalies (Costella): Dr. John Costella, Ph.D. in physics from the University of Melbourne, analyzed the intersprocket area of the film — the region between the sprocket holes that a Bell & Howell camera exposes simultaneously with the main image. He found that the intersprocket images in certain frames are geometrically inconsistent with the main frame images, suggesting the film was rephotographed or composited using an optical printer.
• Background panning errors (Costella): In a camera panned to follow a moving subject, the background should exhibit consistent motion blur. Costella identified frames where background elements show contradictory blur patterns — sharp in areas that should be blurred, and blurred in areas that should be sharp — consistent with optical reconstruction.
• Head explosion imagery (Mantik): Dr. David Mantik, M.D., Ph.D., a radiation oncologist at Loma Linda University, conducted optical densitometry measurements of the Zapruder film originals at the National Archives. He found that the apparent "blob" visible on Kennedy's head in frames 313-314 has optical density characteristics inconsistent with natural photographic exposure, suggesting possible airbrushing or painting on individual frames.
• Missing frames: The film as preserved in the National Archives is missing frames 208-211 (described by Life magazine as "damaged" during a 1963 examination). Researchers have noted that this gap occurs exactly during a critical moment — when the limousine would have been obscured by the Stemmons Freeway sign — and that the splice itself raises questions about what those frames contained.
• Camera speed discrepancy: The FBI initially reported the camera's speed at 18.3 frames per second. The HSCA's testing of Zapruder's specific camera recorded speeds averaging 18.3 fps but with significant variation. Researchers including Horne have argued the camera likely ran faster than officially stated, which would compress the apparent timeline of events and affect calculations of bullet trajectories and reaction times.

None of these findings have been addressed by the Sixth Floor Museum. None have been presented to visitors alongside the film frames the museum displays. The technical analyses may be debatable — but they exist, they are sourced, and they come from credentialed professionals. Ignoring them entirely is an editorial choice, not a scholarly one.

What the witnesses saw — and what the film shows

If the Zapruder film is an unaltered record, it should be broadly consistent with witness accounts. On two critical points, it is not.

• The limousine stop: Over 50 witnesses, including Dallas Police motorcycle officers Bobby Hargis, James Chaney, and Marrion Baker, described the presidential limousine slowing dramatically or stopping during the shooting sequence. Secret Service Agent Clint Hill, who ran to the car, testified that it had slowed to a near-stop. The Zapruder film shows the limousine in continuous forward motion with no stop.
• The head wound: Dallas Parkland Memorial Hospital doctors — including Dr. Malcolm Perry, Dr. Robert McClelland, Dr. Charles Carrico, and Dr. Kemp Clark — described a large exit wound at the posterior (back-right) of Kennedy's head. This is consistent with a shot from the front. The Zapruder film shows an explosion predominantly forward and to the right, which has been used to argue a shot from behind.
• Body movement: In the Zapruder film, Kennedy's head and upper body move sharply backward and to the left at the moment of the fatal shot (frames 312-313). The Warren Commission attributed this to a "jet effect" from a rear-entering bullet. Critics including physicist Dr. Luis Alvarez have debated the physics. The movement is, at minimum, visually counterintuitive for a shot from above and behind.

The discrepancy between witness accounts and what the film shows has two possible explanations: either the witnesses were uniformly mistaken about specific, dramatic details — or the film does not accurately represent what happened. An honest institution presents both possibilities.