" The Apprenticeship " (Season 8, Episode 6) of is a dark exploration of the "Macdonald Triad"—the set of three behavioral characteristics (animal cruelty, fire-setting, and bedwetting) often associated with sociopathic tendencies in children. Episode Summary
Reviewers at Criminal Minds Roundtable noted the episode's effective use of subverted expectations, particularly the "wholesome" appearance of Toby compared to his brutal actions. The episode is often remembered by fans for: [S8E6] The Apprenticeship
The BAU travels to Miami, Florida, to investigate a series of brutal murders involving sex workers. The case is unique because it features a "mentor-protege" dynamic. A young, seemingly wholesome teenager named is the "apprentice" killer, being groomed and guided by an older, more experienced predator named Bobby Putnam . " The Apprenticeship " (Season 8, Episode 6)