Evidence of the contents of a writing, recording or photograph other than the original shall be admissible if:(a) The original is lost or has been destroyed, unless the proponent lost or destroyed it in bad faith.(b) The original cannot be obtained by any available judicial process or otherwise.(c) The original is under the control of the opponent and he does not produce the original at the hearing despite having been put on notice of the necessity thereof.(d) The original is not closely related to the controlling issues and it is inconvenient to require its production.
Puerto Rico Legal Code