S2·E10 Recreational Use

C&L are assigned to work for Sgt. Dory McKenna on a murder investigation. The baddy is a slumlord who is trying to get rid of his tenants so he can make a co-op out of his building. The kicker is that Dory is using cocaine. After he snorts up at Mary Beth's and doesn't show up as backup, Chris threatens to turn him in unless he gets help for his addiction.