Can child support charges be dismissed

The question is too vague to answer with precision, but the short version is that, in Nevada, child support arrears do not expire (no "statute of lmitiations" applies) and both interest and penalties continue to accrue until paid.  There is a commission now in place looking at potential changes to the Nevada child support statutes, but it is highly unlikely that any changes made would be retroactive.  You should consult a family law specialist to get an idea of your options.