Simply because the CASA worker isn't speaking to the foster parent or caseworker doesn't mean that the judge isn't getting relevant information about what is going on with the case. I finished a permanency hearing report today that was 18 pages long, and we submit reports to the court 90 days after every court appearance, so the judges are getting information they need to have, including information about how visitation is going. The CASA workers are also presumably speaking to mental health providers and school officials, and of course, and most importantly, the kids themselves.
I've already said I don't know how the policy came about or why. And when I said "shouldn't have", I didn't mean information the CASA shouldn't have, but something someone may have told someone that was not meant to be shared. Although unless a bio-parent has signed releases allowing their service providers to share information, there is absolutely information that a CASA worker "shouldn't have", otherwise it's a breech of confidentiality. I can't even get information about a bio-parent who is court ordered to work with me unless they have signed a release.
The judges are well aware of the fact that caseworkers and foster parents are not sharing information with CASA. If it bothers them, they don't seem to indicate either way. And the CASA workers know this too, and work around it, and since most of their reports are fairly lengthy, they do seem to be getting enough info. It's not a hostile relationship at all either, at meetings where they also attend (and yes, I inadvertently have to share information), we are friendly and make small talk. One CASA worker is often asking me about the baby I just had six months ago.
Whether I agree with it or not, the county has custody of the children we work with and they have the right to tell their employees who they can and cannot share information with about the child. As someone employed by an agency contracted with the local counties, I have to abide by their rules or I risk losing my job, and the foster parents risk losing the children placed with them.
OP, good luck getting the information you need to do right by the kids you have or will have. I hope you're provided what as much information as possible.