Watch The First Trailer For Louis Theroux's Harrowing New Documentary Series

'Dark States: Heroin Town' airs this week

Having built up a mountain of acclaim and good will over the years, you'd think that Louis Theroux would take it easy on himself for a bit. Maybe do one of those Channel 5 documentaries about long-distance train journeys.

But Theroux is as tireless as he is fearless, so for his next batch of BBC docs he's delving into the hidden, harrowing problems faced by American society, from murder, to sex trafficking to opiate dependency.

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The first trailer has just been released, and the first episode, Dark States: Heroin Town, begins at 9pm on BBC2 this Sunday. Two further episodes, called Milwaukee and Sex Trafficking Houston, will follow.