What is the difference between Serial Killer and Mass Murderer -Serial killers have a psychological problem
-Serial Killer have a cool off period
-Serial Killers do not use guns
-Serial Killers kill more than 3 people

they have a cool off period.

serial killers kill more than 3 victims over a span of month maybe even years. however a mass murderer will kill over 3 victims in a short span of time.

the first part of the statute of limitations is the standard deadline, which gives victims of medical malpractice a certain number of years -- usually anywhere from two to six years, depending on the state -- after the malpractice occurred within which to file a lawsuit.