Ahh...we are a free democracy. People are allowed to leave NZ.
We have people with all sorts of qualifications who head overseas, particularly if they are doing post graduate studies
Perhaps the better solution is to create an employment situation where they want to stay
8% of our NZ registered nurses now work in Australia.
Trapping people here in NZ is not actually solving the problem
Bonding doesn't have to be a forced thing. If I recall correctly there used to be an incentive program where the government would match student loan payments for medical graduates who went on to work in rural areas. In Australia, they even have to go so far as provide free accomodation to regional medical professionals!