I don't get another checking account because Thom could get access to it (since he's my power of attorney and still legally my husband-although we are legally separated and going through the process of divorcing.)
When I worked for a stock transfer agent and someone was using a power of attorney for stock transfer it had to be certified within 5 business days as being in full force and effect and that the maker was still living. Check with your bank and see if they also have a similar policy. I have an account in my name only, and the bank will not discuss specifics with my husband. If he makes a deposit for me, they blank out the amount in the account on the receipt they give him. I would also password protect the account.