California's gun seizure program under the microscope: does it save lives?
NCT ID NCT02318732
First seen Jun 27, 2026 · Last updated Sep 15, 2026 · Updated 2 times
Summary
This study looks at California's program that takes guns away from people who are no longer allowed to own them, such as those convicted of certain crimes or with severe mental illness. Researchers will track 20,000 people to see if the program lowers their risk of future violence or arrests. The goal is to find out if this approach actually makes communities safer.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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20,000 people
The number who actually took part.
- Start date
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Feb 2015
- Expected to finish
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Nov 2026
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Adults with records of firearms ownership who have experienced a prohibiting event. Prohibiting events are based in Federal and California state law. Among others, they include criminal convictions for felonies and selected violent misdemeanors; emergency hospitalization for dangerousness associated with severe mental illness, as specified in statute; and status as respondent to a domestic violence restraining order. Exclusion Criteria: * None.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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UC Davis
Sacramento, California, 95618, United States
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