I need to subpoena an NH non-party witness to a civil action in MA. I have looked at the subpoena rules for both states and cannot seem to find anything specific regarding the topic. In further research, I see that some states require a letter rogatory from one court to the other, etc. But in a NH to MA instance, it seems to me that I just pay them double the witness fee and serve the subpoena. I want to make sure I do this correctly and make sure that the party is compelled to appear. Any help is appreciated.