S4, E12: An inner city baby is rushed to the hospital and eventually dies from a cocaine overdose. Unfortunately, the baby ingested pure liquid cocaine, disguised as baby formula. His mother stole it from an affluent apartment where she worked. Detectives Stabler (Christopher Meloni) and Benson (Mariska Hargitay) seize the rest of the formula from the Pfeiffer residence, where she works, and question the couple, Laura (Laurie J. Williams) and Derek (Bryan Callen). Derek works at an investment firm and had financial troubles, and when they ask him to go to the precinct for questioning, Sgt. Ed Tucker (Robert John Burke ) of IAB intercepts them.