Maryland and Montana have passed the nation's first laws limiting forensic genealogy, the DNA matching technique that found the Golden State Killer in 2018
Virginia Hughes / New York Times :
Context & Ripple Effects
Forensic genealogy went from obscure technique to national story when investigators matched crime-scene DNA to relatives on GEDmatch in the 2018 Golden State Killer arrest, and the field scaled fast — Parabon NanoLabs loaded roughly 100 crime-scene profiles into GEDmatch within a month of that case breaking.
Regulation lagged the casework: the federal response was limited to the Justice Department's interim policy restricting how law enforcement could query genealogy databases for serious crimes. Maryland and Montana are now converting that soft-guidance era into statute, becoming the first states to legislate limits on the technique itself.
First-order effects
- Police departments and labs in Maryland and Montana must now run forensic-genealogy searches under statutory constraints rather than agency discretion, changing how cold-case units and vendors like Parabon operate in those states.
Second-order effects
- Consumer DNA platforms such as GEDmove — the database that cracked more than a dozen cases after the Golden State Killer — face a patchwork of state rules instead of one federal standard, complicating nationwide matching workflows.
Third-order effects
- Montana's companion move requiring warrants for purchased geolocation data signals the same underlying shift: legislatures replacing ad hoc police access to commercial data with statutory process, a template other states may copy for genetic data specifically.
The trend: Law enforcement's access to commercial data — genealogy databases today, location brokers alongside — is moving from voluntary policy and platform opt-outs toward state-level statutory limits, with the first two states setting the drafting template.