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If it's a joint account, then there is no way that one joint account holder can control the use of the account, without the other account holder's express written authorization to the bank.
Either it's not really a joint account, or someone is lying to you about the account status.
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You would have to ask the court to order your spouse to account for and return the money. You would need an emergency order. I suggest that you talk to your attorney -- and if you do not have an attorney, then you need to hire one immediately -- because this is not something that you can do by yourself in court.
If you would like to consult via phone, it will have to wait until morning. My family strongly disapproves of my engaging in business calls in the middle of the night. I hope you understand.
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