No person shall be disqualified as a witness in a criminal case or proceeding by reason of his or her interest in the event of the case or proceeding, as a party or otherwise, or by reason of his or her having been convicted of a crime; but the interest or conviction may be shown for the purpose of affecting the credibility of the witness. A defendant in a criminal case or proceeding shall only at his or her own request be deemed a competent witness, and the person’s neglect to testify shall not create a presumption against the person, nor shall the court permit a reference or comment to be made to or upon that neglect.
     In criminal cases, husband and wife may testify for or against each other. Neither, however, may testify as to any communication or admission made by either of them to the other or as to any conversation between them during marriage, except in cases in which either is charged with an offense against the person or property of the other, in case of spouse abandonment, when the interests of their child or children or of any child or children in either spouse’s care, custody, or control are directly involved, when either is charged with or under investigation for an offense under Section 11-1.20, 11-1.30, 11-1.40, 11-1.50, 11-1.60, 12-13, 12-14, 12-14.1, 12-15, or 12-16 of the Criminal Code of 1961 or the Criminal Code of 2012 and the victim is a minor under 18 years of age in either spouse’s care, custody, or control at the time of the offense, or as to matters in which either has acted as agent of the other.