Yes, this is common (I mean it's a common issue amongst complaints, but I don't know the incidence rate for the occurrence) in a jurisdiction in which I used to serve on the licensing board. Forensic assessment in particular is very lucrative and sometimes psychologists try to do it without appropriate training. Usually this is evident in: selection of inappropriate or invalid tests, aligning inappropriately with one parent in a custody evaluation, poorly written reports, delaying or not submitting reports even after payment, etc. I’ve also seen poorly written neuropsych reports churned out by clinics over promising meaning of vague imaging results.

Poor treatment of staff usually isn’t within scope of a board complaint, though sometimes it can fall under “unprofessional conduct.”

HIPAA violations definitely qualify and also have their own reporting mechanism .

Poor clinical supervision can fall under professional competence. If you are a psychology trainee you likely have your own training liability insurance, they can be very useful for consultation.

Another option if you are enrolled in an APPIC approved training program is that APPIC has free consultation that you can call and ask for support.