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Aconite (derived from Acetylbenzolaconine) is a deadly poison often found in the Aconitum varigatum or simply Monkshood. Aconite is often noted as a potent weapon used by female killers, as it enables the woman to kill silently while being detached from the act.
Through research of both Dexter Morgan and writer Sal Price, it is presumed that Hannah McKay uses Aconite on several occasions to cause heart-attacks (via ingestion) on a few individuals in her past and Dexter later locates a patch of the plant used to create aconite at the green house Hannah runs. She apparently had harvested some recently as well, for what purpose is still unknown.