P.R. Laws Ap. tit. 32A, § IV, Rule 38
2019-02-20 00:00:00+00
Except as provided in these rules with respect to the opinion of expert witnesses, a witness may not testify to a matter unless he has personal knowledge thereof. Against the objection of a party, such personal knowledge must be shown before the witness may testify concerning the matter. A witness’ personal knowledge of a matter may be shown by any otherwise admissible evidence, including his own testimony.