When does arrest occur What is a necessary element
When is a suspect not under arrest
When the suspect mistakenly assumes request from PO is a command or order to be obeyed.
Case law: O’Donoghue (1988) Did the PO convey plainly to the crook that he was under arrest and that he was not free to leave. If the suspect formulated this opinion on his own that the PO requests were a command then the PO did not convey enough that the crook was under arrest therefore any admissions/confessions made were involuntary and becomes inadmissible.