The 17-year-old, whose name was not released, admitted to WPBF-TV, West Palm Beach, Fla., he wore a pellet gun on his hip and flashed a badge Monday at the Walmart in Port St. Lucie to "arrest" a 14-year-old friend he described to employees as a shoplifting suspect.
However, an employee was suspicious and followed the boys to the parking lot, where the older teenager was seen releasing the younger boy.
Police said the younger teen had taken several packages of Yu-Gi-Oh trading cards from the store.
"I mean, everybody's stupid, just not like this," the 17-year-old told WPBF-TV. He has been charged with shoplifting, impersonating a police officer and resisting arrest without violence.
The 14-year-old was arrested on charges of shoplifting and resisting arrest without violence.