The Extreme Risk Protection Order Expansion Act of 2025 aims to bolster State, Tribal, and local capabilities in removing firearms from individuals deemed a danger to themselves or others through court-issued extreme risk protection orders (ERPOs). It establishes a federal grant program, administered by the Attorney General, to provide financial assistance to eligible entities for developing and implementing such laws. Eligible entities, including States and Indian Tribes that enact qualifying ERPO legislation, can use grant funds to enhance law enforcement and court capacities, provide training for personnel, and develop protocols for firearm removal and storage. A significant portion of the grant must be allocated to training law enforcement officers on the safe, impartial, and equitable use of ERPOs, including addressing issues like bias, domestic violence, and interactions with individuals experiencing mental health crises. Funds can also be used for public awareness campaigns to ensure appropriate utilization of these orders. The bill outlines specific requirements for State and Tribal ERPO legislation to qualify for grants, including procedures for petitioners (such as law enforcement officers) to submit sworn petitions, ensuring due process for respondents with notice and an opportunity to be heard, and setting standards for order issuance based on a finding of danger. It also allows for temporary ex parte orders under probable cause, mandates proper storage and return procedures for removed firearms, and requires notification of ERPOs to the Attorney General for inclusion in national databases. Furthermore, the legislation creates a new federal prohibition, making individuals subject to qualifying ERPOs federally ineligible to possess or receive firearms. It mandates the Attorney General to collect and preserve records of individuals subject to ERPOs and allows these orders to be included in national crime information databases. Finally, the bill requires all States and Indian Tribes to give full faith and credit to ERPOs issued by other jurisdictions that comply with the Act's provisions, ensuring their enforceability nationwide.