It's for a grand jury , so different rules apply (Score 2, Informative)

Since it's a Grand Jury investigation, the regular 4th Amendment (search and seizure/probable cause) rules are relaxed. A Grand Jury subpoena only requires that the information obtained isn't a fishing expedition.

This isn't another spying story- grand juries have had the power to read all of your documents to determine if a crime has been committed for hundreds of years.