In terms of the evidence for these false paper marriages, we often see this as a last-ditch effort to remain in New Zealand. A person will have come to the end of their normal work visa or visitor's or student visa and then enter into a relationship for the purpose of trying to obtain a further work visa on the basis of that partnership. This is the way I've become aware of the paper marriages being entered into, when the person is already present in our jurisdiction.
On April 8th, 2014. See this statement in context.