U.S. v. Craft in 2002. The IRS Issued a ruling notice 2003-60 regarding the Craft Supreme court decision which may answer some of your questions.
Since a FIDM is a state request, and tenancy by the entirety is a state rule, I would say it's not attachable to accounts held in husband and wife title. But the customer must raise that issue with the court, not the bank.
Hope that helps.
Michelle III