Sending the men to jail for non-payment reminds me of the old British debtors' prisons. I don't think that's a productive solution since they obviously can't earn the money they need for the payments while they're in jail. In fact, it's an extra expense and cell-space burden for the community to house them in jail.
I support attaching their paychecks and tax refunds but also working out reasonable payment plans.
I truly feel for the moms who have to raise their children without the fathers' financial support. Too often the men are baby makers but not fathers. 
Society also has a responsibility. No, not to pay the child support. Society needs to quit accepting (and even promoting) out-of-wedlock birthing and baby daddies as desirable ways of life.
It seems ironic to me that in this day and age where all kinds of birth control is available, all kinds of sex education is available, and abortion is available there are so many births happening to unmarried women. (I'm not promoting abortion; I'm just stating the reality of what's out there.)
Also, in this age of technology, it's certainly possible to track these men and their incomes, especially before they become years behind in their payments.
As an incentive, increase the fines for delinquent payments, and reduce the fines after the man has a proven track record of making timely payments.
