This will all depend on how the Court System is set up in your State and or County. Typically, anyone who runs a criminal lien whether it be a court, police, sheriff or bailiff, will be able to see if there are open warrants for you in their system. In most cases however, child support court operates separately from criminal traffic court, so the two courts may not communicate with each other directly for the one to know about warrants of another. My advice is to speak with a lawyer and see what his/her fee would be to represent you on both matters. Lawyers will typically give a discount in fee if you retain them to handle multiple matters. Good Luck.