It depends upon whether NJ law applies to your matter.
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If there was never an Order entered by any court establishing a child support obligation you can stop forwarding your checks and that would likely be the end of it, provided your daughter is no longer a full-time student nor has special needs limiting her ability to be self-sufficient.
If an Order exist establishing your child support obligation you will need to secure an Order, whether by consent or by filing the appropriate application in court, to emancipate your daughter and to terminate the child support obligation. Those papers should be filed in the same court that initially established the child support obligation.
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The law of the State entering the first child support order governs emancipation (regardless of where the parties and/or the child live thereafter). If there's no court order, I'd suggest filing a motion in Florida to affirm that your CS obligation ends July 1, 2012. You'd have to get Florida counsel to do this -- do NOT file it in NJ.
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