Rachel McAdams spent a 12-hour shift with authorities to prepare for her role in HBO's True Detective. The actress went into detail about the ride-along when she stopped by The Tonight Show Starring Jimmy Fallon on Friday. As Rachel explains, the night got intense during a break at a convenience store. When a young driver tried leaving the police in the dust, an officer (whom Rachel affectionately calls "J Lo") had to pull her out of the way. Watch Rachel share her story in the video above, then see her reaction to rumors she's dating costar Taylor Kitsch.
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