Rule 615. Exclusion of witnesses. At the request of a party the court may order witnesses excluded until the time of final argument, and it may make the order of its own motion. This rule does not authorize exclusion of

(1) A party who is a natural person;

(2) An officer or employee of a party which is not a natural person designated as its representative by its attorney;

(3) A person whose presence is shown by a party to be essential to the presentation of the party’s cause; or

(4) The victim in a criminal case. [1981 c.892 §56; 1987 c.2 §5; 2003 c.14 §20]

OPINIONS AND EXPERT TESTIMONY