Serial killers are frightening enough locked behind solid steel bars, but what if one was walking freely around your neighbourhood right this moment, and not even the police could stop them from doing what they wanted?
This troubling notion isn't all that farfetched, especially considering every person on this list has committed unspeakably abhorrent acts - murdering tens, sometimes hundreds of people - and are currently living freely.
Some may say they were set free prematurely, released back into society before they'd paid fully for their crimes. It forces you to consider your own safety and ask: Was justice really served?
Crime: Raping her sister and murdering two teenagers
Sentenced to: 12 years in prison
Served: 12 years
Karla Homolka routinely drugged her sister Tammy, allowing Karla and her husband to rape Tammy's unconscious body. Karla would use alcoholic drinks laced with the sedative Halcion in order to subdue Tammy, though her twisted plan backfired one day after Tammy began choking on her own vomit and died.
Karla was also convicted of murdering two teenagers, but managed to convince the judge that her husband was the mastermind behind these sick crimes, claiming she was an unwilling accomplice. In the end, she struck a deal for a reduced prison sentence. Her husband was sentenced to life, but Karla was released in 2005. She now lives in Quebec with a husband and three kids.
Crime: Poisoned 22 victims (though may have murdered up to 138 people)
Sentenced to: 21 years in prison
Served: 12 years
What's perhaps most sinister about Arnfinn Nesset is the fact that he murdered his own vulnerable nursing home patients, all of whom unquestionably trusted him. After being challenged by police, Nesset confessed to killing 27 patients by injecting them with a muscle relaxant. He said he wanted to wield complete control over their lives.
Nesset was sentenced to 21 years, but was released early due to good behavior. His current whereabouts are unknown.
Pedro Alonso Lopez
Crime: Raped and killed more than 300 women
Sentenced to: 16 years in prison
Served: 14 years
Known as 'The Monster of the Andes,' Pedro Lopez's crimes are so reprehensible it's truly inconceivable to think he's currently roaming free. In 1978 it's estimated he had killed over 100 women. He was temporarily turned in to the police, but for some reason they released him soon after.
Lopez then moved to Columbia and eventually Ecuador, once saying "I like the girls in Ecuador, they are more gentle and trusting, more innocent." Here he added at least another 200 to his kill count. Again arrested in 1980, Lopez was committed to an insane asylum until 1998, when he was declared sane and released on $50 bail! No one knows where this mass murderer is currently.
Louis Van Schoor
Crime: Killed 39+ black men
Sentenced to: 20 years in prison
Served: 12 years
A notorious security guard and ex-policeman, Louis Van Schoor shot and killed over 39 black men he claimed were all home invaders; a story quite hard to believe. He was sentenced to 20 years in prison on April 1992, but was released in October 2004.
Questioned by a journalist about his crimes, van Schoor stated:
"To the families and friends of my victims, I apologize if my action caused any hurt and discomfort."
He's currently a free man.