9 signs you're working with a psychopath

screenshot/"American Psycho"

Some of your coworkers may be using manipulation and deception to bully coworkers - even you.

Bullying isn't just for school kids on the playground.

Andrew Faas, a former senior executive with Canada's two largest retail organizations, found this out the hard way when he blew the whistle on a corrupt colleague, and subsequently had his phone and email hacked, and even received an anonymous death threat.

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To help prevent others from enduring the same psychological and physical consequences that he suffered, Faas says in his new book, "The Bully's Trap," that any worker being hired or promoted in a supervisory position should be required to take a psychological test.

"It's not an uncommon metric but, unfortunately, too many people don't utilize it to the extent they should," Faas says.

What would it test for? The 20 signs listed in the Hare Psychopathy Checklist as developed by renowned psychologist Robert Hare.

A psychopath may not show all the signs, but they will likely demonstrate at least some of them, Faas says.

Here are 9 signs that one of your own coworkers may be a psychopath: