You may want to make a complaint to the State licensing board, the CA Board of Behavioral Sciences: http://www.bbs.ca.gov/consumer/complaint_info.shtml
But be sure that your son is willing to have that relationship severed, as that is inevitably the consequence of a complaint, even before there is any investigation or determination of the merits. Based just on the facts that you have summarized here, you have the choice: work through the problem and implement more traditional financial controls if that is your son's wish, or make your complaint and find an alternative therapist for your son. Please don't underestimate the critical importance of letting your son have the critical vote here. It can be very difficult to establish a meaningful and effective relationship with a therapist, and the burden will fall on him to have to build a new one.
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As always, Ms. McCall is spot on. I tend to look at things from a money perspective lately and IF you think this is a habbit and it likely is, she is ripping off the Feds, so, she could do some jail time, could owe some back taxes AND you or your son, as whistle blowers, may be in line for a piece of any recovery by the IRS, if you make such a report to them.
I am not suggesting you should, but, perhaps you could.
If you do, make sure all of your ducks are in a row...