Final answer:
Under the rule of completeness, the defendant's statement about the gun should be admitted alongside the marijuana-related statement to avoid being misleading and to provide full context in court.
Step-by-step explanation:
Yes, the defendant's statement about the gun should be admitted at the same time as the statement regarding the marijuana, based on the rule of completeness. This rule of completeness is a principle in law that dictates when part of a statement has been introduced into evidence, the entire statement should be considered to prevent misleading the court or taking things out of context. Since the circuit uses the rule of completeness as an admissibility rule, the defendant's assertion of ignorance about the gun would be included to provide the full context of his statement about the marijuana. In a trial, it's important for the fact-finders to have the entire statement to accurately assess the defendant's claims and intentions.