The mandatory licensing of immigration advisers was introduced in May 2007  with the Immigration Advisers Licensing Act 2007. Lawyers holding a current practising certificate are exempt from the licensing requirements. Now the Immigration Advisers Authority has introduced a mandatory licensing scheme also for international, off-shore advisers:

http://www.iaa.govt.nz/news/2010/advisers-must-be-licensed.html

Image source:
www.unodc.org