The sequestration of expert witnesses falls under Massachusetts Rules of Evidence, Rule 615. MASS. GEN. LAWS ANN. R. EVID. § 615 (West 2017). This rule allows the court to exclude a witness from the courtroom as to not hear testimony of other witnesses if requested by a party or on its own order. Id. In a civil proceeding, the court cannot exclude either of the parties, and in a criminal proceeding the court cannot exclude the defendant. Id. The trial court is given discretion as to whether it chooses to exclude other witnesses. Zambarano v. Massachusetts Turnpike Auth., 215 N.E.2d 652 (Mass. 1966).