 While the officer must obtain the approval of a Chief Immigration Officer or Inspector to refuse someone entry the way in which interviews are conducted and recorded are based on a lower level of proof than those in other areas of law enforcement.The immigration rules for visitors say that the immigration officer must be "satisfied" that the person is a genuine visitor not intending to stay longer than the rules allow and is not intending to seek employment.The idea that a relatively low ranking officer merely has to satisfy himself or herself as to the person intentions rather than prove an offence, as is the case in criminal matters, is a long-standing cause of legal and legislative tension.