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What is the Combined DNA Index System?
The Combined DNA Index System (CODIS) is a nationwide network that allows federal, state, and local forensic laboratories to compare DNA profiles. According to the FBI, CODIS is both the software that runs DNA comparisons and the program supporting the databases.
One component of CODIS is the National DNA Index System (NDIS), which houses DNA profiles contributed by forensic labs nationwide. CODIS searches link DNA evidence from crime scenes with profiles of convicted offenders, arrestees, or even other crime scenes.
As the FBI explains, CODIS was designed to “compare a target DNA record against DNA records in the database.” Once a hit occurs, laboratories confirm the match, and law enforcement can use the information to establish probable cause for charges.
How Does CODIS Use DNA Profiles to Solve Crimes? – Biology For Everyone
How DNA Matches Solve Crimes
DNA evidence from sexual assault kits often provides the crucial link between an unknown perpetrator and prior records in CODIS. When matches are confirmed, investigators can tie suspects to multiple cases or directly identify an offender.
