The deposition of any witness or other person who may be required to be sworn before the judge, and who shall live out of the state, or who shall be unable to appear and testify by reason of infirmity or other sufficient cause, may be taken before any person duly authorized by the judge.
RSA 547:26
RS 152:17. CS 161:17. GS 170:16. GL 189:17. PS 182:22. PL 293 :25. RL 346:25.