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How to subpoena bank records 
Obtain the proper subpoena form. 
A subpoena for records is called a subpoena duces tecum or a subpoena to produce documents. While the words " duces tecum " are often used in state court to tell someone the subpoena is for records, it is not always used.
In federal court, it is simply called a subpoena to produce documents. Call or visit the court where your case is pending and ask for a subpoena form.