Investigators are now considering the possibility that the serial killer who has dumped at least eight bodies of prostitutes at a Long Island beach could be a law enforcement officer.

According to sources familiar with the case, the killer may have a detailed knowledge of police techniques because he or she allegedly placed several taunting phone calls to a murder victim's relative, reports ABC News.

The calls were placed from crowded spots like New York's Penn Station, where even if police were able to trace the cell signal, it would be next to impossible for surveillance cameras to single out the killer.

Also, the calls were all less than three minutes. Typically it takes three to five minutes for law enforcement to trace a call.

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