Dawson is made to come clean about his drug addiction to pain killers. Voight

Season 6 Episode 9 "Descent"
Dawson’s addiction to pain killers takes a dramatic turn when he gets involved with a drug dealer. Voight gets wind of Dawson’s problem and tries to help him out. Dawson’s daughter is kidnapped, beaten and raped and the Intelligence unit does everything in their power to find her.

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