Officer Doolittle (an undercover officer) suspected John was shoplifting over-the-counter drugs from the local pharmacy. Doolittle asked John to follow him to the back room of the store, where he questioned John for a period of 20 minutes. John is now suing Officer Doolittle for false imprisonment. Which defence should Doolittle use? Discuss and ensure you support your answer.

Please use Canadian Law from Province of Ontario