Wow we are feeling for you as we are in the same boat, however due to modification in CS we actually overpaid therefore the overpayement was put forward and now the case is "semi" closed, cannot be fully (legally) closed till the child turns 18. Now there was a garnishment but due to the fact of the new modification/overpayment that garnishment was closed and therefore no more money can be distributed. Now, is the child 18 and has the child graduated? Do you have access to the records? You may use the FERPA LAW to access the child's school records to see if he/she has graduated, unless the child is now 18 then you cannot access without the child's permission...sticky I know! I am not sure why Riverside would be any different than any other part of CA, we live in N Cal and thus they told us when the child turns 18 a letter is sent to the custodial parent about 2mths prior to the 18th bday to state whether the child has graduated or not, and if they have not graduated they (DCSS) states they have to have legal docs from the school itself proving the child will still be in school, therefore the CS would continue till the child graduates or turns 19...19 is the very end! If you are having issues, then contact your DCSS office and get with someone pronto to have the garnishment stopped. I have heard of cases where this has happened up to a year after the kid has turned 18 and graduated...you just have to be diligent on getting it stopped. Best of Luck1