Part 2—By Reason of Insanity

2/2 Louis examines the grey area between criminal actions and medical symptoms.

Part 1—By Reason of Insanity

1/2 Louis immerses himself in the world of Ohio's state psychiatric hospitals.

Fifteen years after his original documentary, Louis revisits the Los Angeles porn scene.

In America's heartlands, Louis looks at private collections of tigers and chimpanzees.

2/2 Louis meets an alleged triple murderer facing a possible death sentence.

1/2 Louis discovers a strange and violent jail culture in Miami County Jail.

Four years on from Louis's last visit, there are signs of disarray in the Phelps clan.

Louis Theroux spends time with a subculture of ultra-nationalist Jewish settlers.

Louis Theroux is in Lagos, following the local gangs and a paramilitary task force.

Louis meets parents who have turned to medication to keep their children under control.