Mo. Rev. Stat. § 546.270: Failure to testify not to prejudice defendant.

If the accused shall not avail himself or herself of his or her right to testify, or of the testimony of the wife or husband, on the trial in the case, it shall not be construed to affect the innocence or guilt of the accused, nor shall the same raise any presumption of guilt, nor be referred to by any attorney in the case, nor be considered by the court or jury before whom the trial takes place.