Massachusetts Guide to Evidence 2025 Edition MA R EVID § 1120

(a) Courtroom Demonstrations and Demonstrative Exhibits. Demonstrations or demonstrative exhibits, including chalks, may be presented to the jury but are not part of the evidence of the case and do not go to the jury room in the absence of agreement of counsel.

(b) Experiments. A witness may testify about the results of an experiment if the trial judge finds that the experiment is reliable and sufficiently similar to the circumstances of the issue and that the witness is qualified as an expert in the relevant area.

(c) Computer Simulations. A party may present the results of a computer simulation if the trial judge finds that the simulation is based on a reliable methodology and that the underlying data is sufficiently complete and accurate.