FBI's Zodiac Fingerprint Report: 18 Suspects, Zero Matches

# FBI's Zodiac Fingerprint Report: 18 Suspects, Zero Matches By DeClassX

On December 5, 1969, as the Zodiac Killer's taunting letters continued to arrive at Bay Area newspapers and the San Francisco Police Department scrambled for leads, a quiet bureaucratic verdict was being typed up inside the FBI's Identification Division in Washington, D.C. The document — Latent Case No. A-10042 — carried no dramatic language and made no accusations. It simply reported what the science had found: the latent fingerprints recovered in the Zodiac case did not match the fingerprints of eighteen individuals under scrutiny. No palm prints were available for comparison. The case, at least along this particular investigative thread, had reached a dead end.

This single declassified page, sparse as it is, offers something rare: a direct look at the FBI's active forensic involvement in one of the most notorious unsolved serial murder cases in American history.

By late 1969, the Zodiac had already claimed at least five confirmed victims across the San Francisco Bay Area and had sent a series of cryptographic letters to local newspapers, some containing what he claimed were pieces of his own identity encoded in cipher. The killer appeared to relish contact with the press and law enforcement alike, and investigators were working with a mounting pile of physical evidence — including the ciphers, postage stamps potentially licked by the killer, and other materials that might yield fingerprint impressions. The FBI's Latent Fingerprint Section, housed within the Identification Division at headquarters in Washington, was the premier forensic resource available to field offices at the time. When the San Francisco field office needed prints analyzed, they sent them to D.C.

The document's header tells us this report was addressed to the Special Agent in Charge (SAC) of the San Francisco field office, referencing an airtel — an air-mailed teletype communication — dated November 28, 1969. That airtel had apparently transmitted the fingerprint specimens and the examination request. The turnaround was just one week, suggesting the Bureau treated this request with reasonable urgency.

What stands out immediately is the case designation in the "RE:" field: ZOOTAC. This appears to be an internal FBI case name or code name — possibly a variant or misspelling of "Zodiac" as rendered in official filing, or an intentional cryptonym used to identify the investigation within Bureau records. Alongside it is the word EXCORTION, likely a garbled or phonetic rendering of "extortion" — a charge the FBI could theoretically assert jurisdiction over, since the Zodiac's letters to newspapers had been interpreted by some as threatening in nature toward the public at large. Federal jurisdiction in serial murder cases was not automatic in 1969; the FBI typically needed an interstate angle or a specific federal violation to justify formal involvement. Framing the case partly as extortion was one way to keep the Bureau's hand in.

The heart of the report is its findings, stated in the careful, distancing language that characterizes forensic documents of the era: "Latent fingerprints and latent impressions previously reported in this case not identical with fingerprints of eighteen individuals who may or may not be the eighteen other individuals mentioned in receipt." This deliberately hedged phrasing — "who may or may not be" — signals that the FBI was being cautious about asserting the identities of the individuals compared. It is possible that some of the eighteen names were provided by the San Francisco field office as persons of interest, while others may have been identified separately through different channels. The document does not specify who these eighteen individuals were; that information, if it exists in accompanying pages, remains either classified, redacted elsewhere, or simply not part of this released page.

Also notable is the line: "No fingerprint records located here for [REDACTED]." At least one individual — whose name has been redacted in the declassified version — had no fingerprint records on file with the FBI at all. In 1969, the FBI's fingerprint repository was the largest in the world, containing records from criminal arrests, military service, and federal employment. The absence of a record for this individual could mean they had no prior interaction with federal systems, or it could mean their records were stored under a different identity. Either way, the redaction itself is an invitation to speculation that the document cannot resolve.

The routing slip at the bottom of the page lists some of the most powerful names in FBI history: Clyde Tolson, Hoover's deputy and closest confidant; Cartha "Deke" DeLoach, the Bureau's liaison to the White House; William Sullivan, head of the Domestic Intelligence Division; and Mark Felt, who would later be revealed as the Watergate source known as "Deep Throat." These names appear on a standard routing checklist — a bureaucratic formality indicating who in the upper echelons of FBI leadership received copies of significant reports. Their presence here does not necessarily mean each man actively reviewed this specific document, but it confirms that the Zodiac investigation was circulating at the highest levels of the Bureau's internal information chain.

The document is signed — or at least attributed — to John Edgar Hoover himself, with a handwritten signature appearing at the bottom. Standard FBI reports of this era bore Hoover's name as Director by default, but it is worth pausing on: the most powerful law enforcement official in American history had his name formally attached to a fingerprint report in a case that would never be solved.

What this document ultimately represents is the machinery of mid-century American law enforcement working at its methodical best — and still coming up empty. Eighteen individuals examined. Zero matches. One redacted name with no records at all. The Zodiac's identity, if it was ever captured in ink on a federal fingerprint card somewhere, was not recognized here.

The open question this document leaves behind is the one that has haunted investigators for over fifty years: whose names were on that list of eighteen? If those comparison subjects were ever formally identified in accompanying case files, some of those records may still be waiting in an archive — classified, misfiled, or simply undigitized. For researchers working the Zodiac case, Latent Case No. A-10042 is not a dead end. It is a door left ajar.