Jake Gyllenhaal says he turned to his friends in law enforcement to help him prepare for his new movie Prisoners.
The actor takes on the role of Detective Loki, a man who is heading the investigation for two missing children.
And Gyllenhaal says that he was particularly interested in the effect that these investigations have on the officers themselves.
Speaking to Flicks and Bits the actor said: "I have a lot of friends who are in law enforcement from other films that I have done, so I immediately went to them.
"Some of them are detectives, and also I also specifically wanted to know about missing children and what those types of investigations were like emotionally for police officers and also just the way they go about things.
"I had piles of written research and then also video research. Particularly what was fascinating for me was watching interrogations and seeing how the human species, we assume something of someone, we are skeptical of them, but they can become very different from who they were. More often than not it’s an equation that follows no rules."
Prisoners is set to be one of the most hard-hitting films of the autumn as Gyllenhaal teams up with Hugh Jackman and director Denis Villeneuve.
The movie has been winning over audience and critics on the festival circuit; with Gyllenhaal and Jackman being tipped as possible Oscar contenders.
Prisoners is the first big screen outing for Gyllenhaal since End Of Watch at the back end of 2013.
Prisoners is released 27th September.
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