Sounds alot like grasping for strwas basically you have to ask yourself this do you want to claim this child if you sign your rights away you probably wonn't have to pay anything future or back you could file a appeal and talk to the judge about the situation and air your concerns to them this would be where they listen to you

You can appeal any judge's ruling and while I agree with you you shouldn't have to pay when the mother withheld information this long and married shortly after the birth. You can have another independent lab redo the DNA but I sincerely doubt any lab is going to be part and parcel to a fraud. There also has to be a little give and take in the support but no visitation. It is also possible that her hubby may have known about the paternity which makes him culpable to you for withholding such info. Whatever you do, remember the child in the midle of this fight. Keep her at arm's length so she's out of the line of fire. Get yourself an attorney who can get things brought down to a level playing field. If you can afford an attorney there are pro bono (free work) attorneys in the state county and city. Google and start round two

1st...your child needs food, clothing, and shelter daily. Not just within the three year time limit you suggest. The oarent who is providing 100% of their support has the right to ask you to contribute at any time. You are out of luck there. You may receive consideration because you were unaware of the child, but that is difficult to prove. More likely than not, you will be paying back child support.

2nd... What do you think is wrong with your genetic testing? Even if you believe that mother somehow manipulated the test, all she has access too you are her and the child's samples at the time when they are taken. Unless she tracked down some other kid you fathered and had them swabbed, that is your child. Genetic testing is a multi-billion dollar industry. No lab is going to face fraud charges and lose its credabillity just to nail you.