Trial and Error

The school's chemistry lab catches on fire, and when Mo's burned chemistry book is found in the rubble, Mo becomes the prime suspect and he gets suspended, prompting T.J. to defend him. After it seems Mo may be done for during a mock trial that T.J. convinces Principal Whitfield to hold, T.J. and Mo sneak in to the school so T.J. can do forensic work on the chemistry book. T.J. finds out that it is actually Mo's hated teacher Mr. Bringleman who set the fire after T.J. gets him to confess that he accidentally set the fire after leaving a lit cigarette in the classroom. Meanwhile, Marcus tries to get noticed in the school play, even though his role has no lines.