P.R. Laws Ap. tit. 32A, § IV, Rule 42
2019-02-20 00:00:00+00
(A) Jury. — Means the whole body of persons and “juror” is a member of that body.
(B) A juror sworn and impaneled in the trial of an action may not be called to testify in that trial as a witness. If he is called so to testify, the opposing party shall be afforded an opportunity to object out of the presence of the jury.
(C) Upon an inquiry into the validity of a verdict, a juror may not testify as to any matter occurring during the course of the jury’s deliberations, or to his reasons for assenting to or dissenting from the verdict, or concerning his mental processes in connection therewith. However, a juror may testify on the question whether extraneous or improper information was brought to the jury’s attention.