Assertion: serial killer | /r/HasAspect | a period of cooling off
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Source sentences:
text: In addition, serial killers have a period of “cooling off” which can last a range of time but all murders have a common characteristic mentioned by the National Center for the Analysis of Violent Crime (NCAVC) of the F.B.I, which include “a lack of remorse or guilt, impulsivity, the need for control, and predatory behavior” (2005).