Prior to the start of the events in Season Three, Zack was busted with his drug dealer, Freebo. After that, Zack and Freebo didn't see each other for two years, during which time Zack started hanging out with Chicky Hines. When Chicky was arrested for a carjacking/homicide, Zack knew that he was innocent and who the real killer was. However, he didn't provide an alibi to help Chicky who was then falsely convicted of murder. Later, when Detective Joseph Quinn and Sergeant Angel Batista went to question Zack in an attempt to find Freebo, they found Zack (and his girlfriend) in possession of illegal drugs. Zack offered the information that could prove Chicky Hines innocence if they would not arrest him. The information was vetted and verified but.whether it eventually helped get Hines released from prison is unknown.