Grievous Bodily Harm

Cal's old friend Terry Marsh (Lennie James) attempts to pull him into a criminal conspiracy after he settles Terry's gambling debts. The criminals abduct both Cal and Terry and try to recruit Cal to be their personal lie detector, forcing him to determine the validity of a client's counterfeit bills. Over the course of the episode, it is revealed that both Terry and Cal got into trouble with the police when they were young, and that Terry volunteered to take all the blame, allowing Cal to continue with his life. The event ends with an FBI raid, and Lightman tells Terry that they're even. Meanwhile, the Lightman Group probes murderous threats against a high school. They determine that the threats were made by Stacey, an overweight student, who is suicidal due to emotional attacks by her classmates and gym teacher. After Stacy attempts to overdose in the bathroom of the Lightman Group, it is revealed that the gym teacher instigated and participated in the emotional attacks against Stacey. Jasmine, one of the bullies, gives a genuine apology to Stacey, and corroborates Stacey's accusation. The gym teacher is arrested for obstruction of justice because he received the threats and did not report them.