In front of the ABC Clothing store on Saturday night. Policeman Frank has just received a call from a dispatcher that a burglary has just occurred at ABC Clothing Store. John Doe fits the description of the suspect and the police officer sees a bulge in the suspect's pocket. Policeman Frank stops John Doe and frisks him when he finds a gun. He runs a check on John Doe, determines that John Doe is a convicted felon. He arrests John Doe for possession of a firearm by a felon. After the search, Policeman Frank gets a call from the dispatcher that the burglary suspect is in custody. But John Doe is charged with possession of a firearm by a felon. John Doe pleads not guilty to the possession charge.

Is the gun admissible evidence in court? Why or why not?