What type of documents can a subpoena command a witness to produce?

A subpoena can command a witness to produce a wide range of materials pertinent to a case, which includes both electronically stored information and tangible items. This aspect of subpoenas is significant because it acknowledges the modern landscape of information where data is often stored electronically. As such, it allows for the inclusion of emails, digital files, and other forms of electronic evidence, in addition to physical documents like contracts, photographs, and any other relevant materials that can aid in the proceedings of a case.

The ability to command both types of evidence ensures that the legal process is comprehensive and can thoroughly consider all relevant information that may influence the case's outcome.