Creates a legal presumption that certain named “exposure-related cancers” suffered by public safety officers are presumed to be line‑of‑duty injuries and therefore eligible for benefits, and requires the administering Bureau to review and update that list at least every three years with a petition process. Also clarifies and expands the definition of “line of duty action” to include actions taken at an agency’s direction or that officers are authorized or obligated to perform, makes the change effective retroactively to January 1, 2020 for covered death and disability claims, and gives affected people a three‑year window after enactment to file claims under the new rules.