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• Increased transparency and accountability in policing, authoring SB 524, which requires police to disclose when they use AI to write police reports, and to maintain a paper trail of body camera footage or audio used to create the report.
• Cracking down on illegal dumping, introducing SB 1218, which requires the DMV to refuse to renew vehicle registrations if an applicant has delinquent illegal dumping fines. 
• Helping attract new businesses to Oakland, authoring SB 304, which lifts land use restrictions at Jack London Square.

• Authored America’s first law targeting 3D-printed ghost guns, co-authoring SB 704, which prohibits sales of firearm barrels unless conducted by a licensed firearms dealer. Previously, firearm barrels were unregulated and could be bought online or in a store without a background check, and were often used by criminals to modify untraceable ghost guns.
• Working to increase oversight on the importing of guns to California, authoring SB 948, which requires a firearm importer to obtain a firearm safety certificate and requires them to take a class on gun safety. The rightwing Townhall called this “another stupid gun control bill.”

• Banned ICE agents from wearing facemasks to hide their identities in California, co-authoring SB 627, the No Secret Police Act, America’s first such law. Donald Trump’s Department of Homeland Security called Arreguín’s bill “despicable.”
• Protected hospital and health clinic patients from ICE, authoring SB 81, which bans healthcare providers from sharing patients’ immigration status with federal agents, and created ICE-free zones in hospitals and healthcare facilities.
• Ensured families and students are notified by schools when federal agents could conduct immigration raids, by co-sponsoring SB 98.
• Secured funding for legal defense for immigrants facing deportation.

• Expanded access to childcare programs, by authoring SB 792, which increases eligibility for working families.
• Strengthened unemployment support for laid off workers, authoring SB 617, which requires employers to provide critical information on services available to employees impacted by mass layoffs.
• Negotiated a multi-million-dollar transit loan from the State to help save Bay Area public transit, and authored a ballot measure to fund affordable, accessible public transit in the Bay Area for future generations.
• Standing up for worker safety, authoring SB 1330, which increases penalties for attacks committed against essential front-line utility workers.