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UnitAura(unit, index, 'HARMFUL|RAID') will return values only for debuffs on friendly units your current character can dispel. It will return nil for poisons when you are on your priest. It will also return nil for poisons when your druid has not learned "Remove Corruption" yet. However it does not work with honor talents. It will return nil for magic debuffs on your hunter, even when "Survival Tactics" is known and active.
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