Chain of evidence

Chain of evidence is the documented continuity of a physical or biological sample from its recovery through handling, transfer, examination, and storage. In the Frank Peterson case, investigators treated that continuity as essential to making evidence usable and defensible; the later dispute over DNA also shows its limits. A properly tracked sample may still be mixed, degraded, or misinterpreted, so procedural integrity and the meaning or reliability of a result are related but distinct questions.

Recording the Chain

A forensic account of the branch recovered as evidence specified its dimensions, the location of fingerprints, and the sequence by which it reached the examiner. State Criminalistics photographed and lifted the prints before Detective Ralph Anderson and Trooper Yunel Sablo conveyed the branch onward. The report expressly affirmed that the chain remained intact, connecting the item’s initial processing with its later examination rather than treating the laboratory result as detached from its handling history.

The account also distinguished samples by source and type. Blood on the branch was identified as Frank Peterson’s O-positive blood, while a second, rarer AB-positive type was considered potentially attributable to the perpetrator. The report described those findings as observations and qualified the proposed attribution as a belief, not an independently established identity. Preserving the chain could establish where a sample came from and how it was handled; it did not turn an inference about whose blood it was into certainty.

Transfers and Collection

Other evidence received similarly explicit transfer histories. Blood samples from the abandoned Econoline van were conveyed to the examiner by State Criminalistics personnel. Blood-bearing clothing recovered from a Subaru was conveyed by Trooper John Koryta and a criminalistics sergeant. In each instance, the report named the people who transferred the materials and stated that the chain remained intact. These details made accountability part of the evidence record: the claim depended not only on what testing found but also on a traceable route from recovery to examination.

The handling of Terry Maitland’s cheek swabs made that principle visible step by step. An officer took a swab from each cheek and held it up to a camera; another placed the vials in a bag, displayed the bag on camera while sealing it with a red evidence sticker, and signed the chain-of-custody sheet. The samples were to be shown again on camera when stored in the Flint City Police Department evidence room, then conveyed by other officers to Cap City for testing. Ralph Anderson wanted no weak links in that sequence, because a procedural lapse could give the defense grounds to challenge the samples and compromise their use.

Testing and Limits

The chain-of-evidence procedure did not remove the practical delays or interpretive limits of forensic testing. DNA samples were sent to Cap City, where the queue ordinarily meant waiting weeks or months; the severity of the crime and the victim’s age gave the case priority, but a report was still expected only after further processing. Maintaining custody of a sample therefore did not mean that a result was immediate, nor did it guarantee that the result would answer every question investigators asked.

The later account of the DNA evidence further separates custody from evidentiary strength. The samples from the Figgis Park scene contained DNA from both perpetrator and victim and had been exposed to ultraviolet light during another testing procedure. Prosecutors said the material was degraded and would be inadmissible, describing it as worthless for court purposes. This did not establish that the chain had been broken; it showed that a traceable sample can nonetheless be compromised in its composition or condition, weakening what can responsibly be inferred from a match.

Evidentiary Meaning

The distinction mattered because DNA matching had appeared decisive in both the Maitland case and the later case against Heath Holmes. In Holmes’s case, cheek swabs taken in custody matched semen recovered at the scene, while other evidence was also cited. In the public review of the Maitland prosecution, however, the DNA samples were described as mixed and degraded, and therefore unsuitable as reliable courtroom evidence. The recurrence of a seemingly powerful match across two investigations sharpened the need to ask what was tested, how the sample had been handled, and what limitations applied to the result.

The chain of evidence thus functions in the novel as a necessary procedural discipline rather than a guarantee of truth. Ralph’s insistence on documenting every transfer reflects the stakes of a case in which physical evidence seemed to support a confident accusation. Yet the eventual reassessment depended on distinguishing the existence of a record from the validity of the conclusions drawn from it. Custody can protect a sample’s history; it cannot, on its own, resolve contradictions, establish identity, or make compromised material fit for court.