Modifies provisions relating to workers' compensation for certain first responders, establishing a rebuttable presumption for cancer and other certain occupational diseases contracted by firefighters and fire investigators

HB 3096 establishes a rebuttable presumption that certain cancers and occupational diseases (including heart, respiratory, and specific cancers like lung or prostate cancer) contracted by firefighters and fire investigators are work-related, shifting the burden of proof to employers to disprove the connection. It also adds PTSD as a compensable occupational disease for first responders when diagnosed after experiencing specific qualifying traumatic events, such as witnessing severe injuries or deaths. The bill updates Missouri's workers' compensation framework to cover these conditions without requiring proof of direct causation, provided clear evidence links the condition to job-related exposures or events. This directly affects paid firefighters and fire investigators certified under state law who develop covered illnesses during their duties.