The island is subject to separate <answer>immigration</answer> controls from the remainder of Australia. Until recently <answer>immigration</answer> to Norfolk Island even by other Australian citizens was heavily restricted. In 2012, <answer>immigration</answer> controls were relaxed with the introduction of an Unrestricted Entry Permit for all Australian and New Zealand citizens upon arrival and the option to apply for residency; the only criteria are to pass a police check and be able to pay into the local health scheme. From 1 July 2016, the Australian migration system will replace the <answer>immigration</answer> arrangements currently maintained by the Norfolk Island Government.
What has been heavily restricted in Norfolk Island, until recently?
immigration