<Li> They were frequently bullied or socially isolated as children or adolescents . For example, Henry Lee Lucas was ridiculed as a child and later cited the mass rejection by his peers as a cause for his hatred of everyone . Kenneth Bianchi was teased as a child because he urinated in his pants, suffered twitching, and as a teenager was ignored by his peers . </Li> <Li> Some were involved in petty crimes, such as fraud, theft, vandalism, or similar offenses . </Li> <Li> Often, they have trouble staying employed and tend to work in menial jobs . The FBI, however, states, "Serial murderers often seem normal; have families and / or a steady job ." Other sources state they often come from unstable families . </Li> <Li> Studies have suggested that serial killers generally have an average or low - average IQ, although they are often described, and perceived, as possessing IQs in the above - average range . A sample of 202 IQs of serial killers had a median IQ of 89 . </Li>

What are the qualifications of a serial killer