Thanks if you have read my earlier 2 posts, if not please read. The first post tells about details about no poach agreement and referral and ethical dilemma.
Here is the third part, ethical policy. To be very frank, there is hardly any organisation who will have no poach as a policy. Still, if you want to implement this as a policy, you may use following. This policy particularly designed considering the ethical dilemma. You may modify it according to your need.