I am curious about how subpoenas work across state lines. Let's assume that a matter is before the county court in NJ but information is needed from a person domiciled in NY. It seems that an NJ attorney could simply bring the subpoena to a court clerk in NY and it would have the same force as if it were issued in NY. However, it doesn't seem to be the same in NJ. In other words, if the action is in NY, how hard is it to subpoena someone in NJ?