Million Dollar Buff Adam-12 : Season 4 Episode 2

Police "buff" Jennings Thornton (a thorn in the side for Malloy and Reed) is back, and intervenes in a drunk driving case, runs down a shooter after a robbery (and nearly kills Reed), and finally is arrested for falsely arresting two men for stealing their own mag wheels. Another case involves a woman who stole an expensive ring from a store, leaving a cheap one in return; the suspect is found during a parking lot dispute and booked when a search found the ring on her.