I still don't know who initiated the CPS complaint, or what that complaint said.
A reader claims that it is most likely that the school psychologist filed the complaint with CPS. He says that it is extremely unusual for a school psychologist to be so actively involved in a CPS investigation, and yet to never have even contacted the parent. Normally school psychologists do everything they can to get the parents involved.
I don't know, but that would explain a number of things. It would explain why the school has been so secretive and hostile. It would explain why the CPS social worker was so strangely evasive when I asked the simplest question about the school psychologist. It would explain why CPS took such a frivolous complaint so seriously -- similar complaints from a bitter ex-wife might have been ignored.
Regardless of who filed the complaint, I really object to the way that the school has promoted the investigation, and actively tried to turn the kids against me. And of course my ex-wife is using the opportunity to make a case against me. But most of all, I object to CPS deciding against me without even telling me what the accusations are. CPS cannot even point out any wrongdoing.