1. www.google.com
2. enter key word "bad check ca" (or your state name)
3. find a form in your county or state. for example, this one:
http://co.el-dorado.ca.us/eldoda/pdf/BadCheckCrimeReport.pdf
4. turn in the form
http://www.ckfraud.org/penalties.html
more info:
http://groups.wenxuecity.com/groupview.php?gid=198