Lucien was referring to the Macdonald triad: a psychology-based theory that suggests that a set of three behavioral individualities – animal cruelty, obsession with fire setting, and persistent bedwetting past the age of five – if all are present together while young, can be associated with violent tendencies later in life, particularly homicidal behavior. Though studies have shown that statistically no significant links between the triad and violent offenders have been found, if the triad is split, animal cruelty is by far the individuality that had been proven to manifest itself in the early
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