The Passage of the DNA Identification Act of 1994 gave the FBI authority to maintain a national DNA database and helped establish CODIS, a system built to move forensic profiles from local laboratories through state databases to national comparison. Its importance lies in the infrastructure it created: DNA evidence could be compared beyond the jurisdiction where it was collected, while the expansion of that capability remained shaped by law, laboratory practice, and rules governing access to genetic information.

Legal Authority and the Database Network

The Act established federal authority for a national database, but CODIS operates as a layered system rather than a single storehouse. Local crime laboratories enter unknown crime-scene samples and qualifying suspect samples into state databases. Those databases verify samples and conduct comparisons within the state before profiles are advanced to CODIS for national comparison.

California illustrates the routine flow of information within that structure. Samples entered into its system are automatically uploaded every Tuesday; the state also collects DNA from jails and courthouses. The result is a chain in which local evidence, state-level collection and comparison, and national matching serve distinct functions. A national database depends on those lower levels to gather, process, and pass along profiles.

From Early Testing to Cold Hits

The national system emerged as DNA testing itself was changing. When the Orange County Crime Lab began incorporating DNA analysis in the early 1990s, working a case could take up to four weeks. Testing required a comparatively large, well-preserved biological sample; a bloodstain about the size of a quarter could serve as an example. The book contrasts that early process with later methods capable of producing a genetic fingerprint from a smattering of skin cells in hours.

In the mid-1990s, laboratories relied on RFLP analysis, a laborious early profiling method. In December 1995, Orange County prosecutors, detectives, and criminalists began submitting evidence from old unsolved cases to a new California Department of Justice laboratory in Berkeley. The state database was still in its infancy, with four thousand profiles of known violent offenders, many of them sex offenders, and the submissions helped it grow.

Six months later, in June 1996, Orange County recorded its first cold hit: crime-scene DNA matched that of Gerald Parker, a prison inmate identified as the serial killer of five women. The match also connected him to an attack on a pregnant woman whose fetus did not survive. Her husband, who had spent sixteen years in prison for the attack after sustaining injuries that caused severe memory loss, was immediately exonerated. Parker was a month from release when the database match was made. The discovery showed how comparison could do more than identify a suspect: it could also overturn a wrongful conviction before a dangerous offender left prison.

Old Evidence and Institutional Change

The first Orange County submissions produced a result that altered how investigators viewed neglected evidence. Materials that had sat undisturbed for decades in the Property Room could now be reconsidered as potential sources of DNA profiles. The account evokes the stored items as time capsules of lives cut short, while emphasizing the practical burden of unresolved cases: boxes of evidence represented work that had accumulated without a way to make all of it searchable or comparable.

That shift depended on more than a statute or a laboratory instrument. The Act supplied federal authority; laboratory methods made profiles possible; and databases provided a means of comparing them at scale. As the technology became faster and more sensitive, evidence that once seemed too old or too small to be useful could enter a broader investigative process. The Orange County cold hit made that institutional change concrete by linking a developing database to both the identification of a serial killer and the release of an innocent man.

The Continuing Boundary of Genetic Searches

The book also sets the public database system beside the later possibility of searching commercial genealogy databases. It notes that 23andMe had 1.5 million profiles and Ancestry.com had 2.5 million, creating a potential route from crime-scene DNA to a perpetrator through a genetic relative. But both companies declined to work with law enforcement, citing privacy concerns and their terms of service. The account further identifies privacy and illegal-search-and-seizure concerns as barriers to that approach.

That later debate marks a limit, not an extension automatically authorized by the 1994 Act. A national forensic database and a commercial genealogy service involve different access conditions and expectations. The legal framework that enabled broad comparison within CODIS therefore did not erase the question of where investigators may search, or what kinds of genetic data they may use. The Act’s significance is presented both in the investigative capacity it helped create and in the continuing need to define the boundaries of that capacity.