Suppose a party to a proceeding has obtained summons to a witness from the court.
The witness lives in the town (as per their digital footprint) but is not responsive. The party has no idea where to find them physically.
Does the party have any legal leverage to engage the police (or other competent authorities apart from private investigators) to help locate the witness and serve the summons on them? Or is it just the party's bad luck that the witness cannot be located and served on?
(Any common law jurisdiction).