can i sue my x husband for the money he hides from child support by working off the books.

i know my x husb. works off the books. i am going to prove it. if i get video of him working, statements from people, notorized and not, that he works. audio of him stating that he works. if i can prove what he makes, and for how long he has been making that. will i have a case to sue him for what he should have been paying in childsupport, and 1/2 of daycare. yes i have a child support order, and it means nothing. im am soon to have an interstate officer, and that means nothing. he knows that there are men further behind than his 31,700.00, and feels untouchable. im dedicated to this. im in for the long haul. the memory of my children and myself in a homeless shelter gives me strength to see this through. we have a good life now, and it is time to help see justice through.