DNA Testing & Abatement of Child Support

As a guardian ad litem (GAL) and domestic relations mediator in New Mexico, I occasionally meet men confronting the question of whether they can or should seek belated DNA testing to either challenge, or avoid a child support order.  As a mediator I can only provide legal information (if competent to do so), not legal advice, so I cannot answer that question directly.  However, I often encourage the parent to think of this as not just a legal question, but a personal and moral one