A subpoena duces tecum is used to compel the production of documents that might be admissible before the court (duces tecum is Latin for bring with you).
Source: West's Encyclopedia of American Law, published by Thomson Gale
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A "subpoena duces tecum." directs an individual to come to court
and directs that certain items be brought with them. A 'regular'
subpoena simply directs the individual to come to court.
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duces tecum
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Duces tecum. Used mostly as follows: Subpoena duces tecum.
Meaning: A command to a witness to produce documents.