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Undetermined (NFPA 921)

The NFPA 921 conclusion category that records insufficient evidence to establish origin or cause at the 'possible' level or above. Represents the scientifically honest conclusion when data is insufficient, not an investigative failure.

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ATF NCETRBDDSCFSLDSTL Fort HalsteadENFSI EWGIgnitable liquid residue (ILR)NFPA 921Origin-and-cause determinationPost-blast analysis

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