This isn't really accurate. According to the FBI:
The validity of spree murder as a separate category was discussed at great length. The general definition of spree murder is two or more murders committed by an offender or offenders, without a cooling-off period. According to the definition, the lack of a cooling-off period marks the difference between a spree murder and a serial murder. Central to the discussion was the definitional problems relating to the concept of a cooling-off period. Because it creates arbitrary guidelines, the confusion surrounding this concept led the majority of attendees to advocate disregarding the use of spree murder as a separate category. The designation does not provide any real benefit for use by law enforcement.
The different discussion groups at the Symposium agreed on a number of similar factors to be included in a definition. These included:
• one or more offenders
• two or more murdered victims
• incidents should be occurring in separate events, at different times
• the time period between murders separates serial murder from mass murder
In combining the various ideas put forth at the Symposium, the following definition was crafted:
Serial Murder: The unlawful killing of two or more victims by the same offender(s), in separate events.
Psychologists are interested in motivations/patterns/consistencies, but not the authorities.
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