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Yu-Gi-Oh! ARC-V episode 103: "Rise of the Resistance"
The Juvenile Officers are an organization that serve as enforcers for Duel Academy. Their primary duty is handling the institution's deserters who no longer desire to support the Arc Project. Due to their status as a detention group, their members are authorized to use force.
While facing an escapee, they can at best detain the offender and place it through a forceful "correctional program" or downright seal them into cards at worst, which is seemingly left to their own discretion.
Like most members of Duel Academy, their agents Duel their target through ganging, subduing them through numbers. Their rank within the Duel Academy hierarchy is unknown.
When students attempted to escape from Duel Academy, the Juvenile Officers are dispatched to capture them. One day when a female student and Alexis escaped from Duel Academy, the officers caught them and sealed the girl in a card. Before they managed to seal Alexis away, Yusho Sakaki arrived and defeated them. Since then Alexis has been the only student they had problems catching.
When the citizens of City thought Zuzu was fugitive from Duel Academy three Juvenile Officers chased her. When they cornered her, the officers were about to Duel Zuzu but Alexis stepped in and commenced a Battle Royal with the trio. The three Officers all Fusion Summoned "Full Armor Canine - Bullfortress" and boosted their ATK to high levels. Alexis questioned this as she activated "Machine Angel Ritual" to Ritual Summon "Cyber Angel Vrash", purged the field of the Juvenile Officers' Fusion Monsters with its effect, and attacked all three directly after dealing effect damage, winning the Duel.
The Juvenile Officers use "Armor Canine" Decks, which focus upon Fusion Summoning their ace card, "Full Armor Canine - Bullfortress". They also run large numbers of "Fusion" and "Polymerization" cards to send to the Graveyard via the effect of "Bullfortress" in order to bolster its ATK and overwhelm the opponent through sheer force.