ON PETITION FOR TRANSFER
We grant transfer in this criminal appeal to discuss the application of the ef-feets of battery statute.
Factual and Procedural Background
Julie Marley, aged thirty-one, and her boyfriend, Gary Williams, were charged with murder, attempted murder, criminal deviate conduct, and two counts of criminal confinement, all in connection with the death of Donald Marley, Marley's uncle, aged seventy-one. According to Marley, on the evening of June 10, 1997, Marley, Williams, and Donald drank beer and wine for approximately sixteen hours at Donald's house. Gloria Smalling, a neighbor of Donald's, joined this marathon at some point before Marley and Donald began to argue. After Donald threw a plate at Marley's head, Marley left Donald's house, spoke with her mother by telephone, and returned. The fighting resumed when Marley demanded an apology from Donald, who had been convicted of molesting Marley when she was fourteen years old. During the course of the argument, Donald cut Marley's finger and leg with a knife, and she stabbed him in the chest. The argument appeared to subside when Marley drank a beer and gave another to Donald. However, when Marley renewed her demand for an apology for Donald's past behavior, he replied, "You little bitch, you wanted it," and, according to Williams, Marley "went ballistic."
Marley then forced Donald and Smalling at knifepoint to an upstairs bedroom and tied up Smalling. Marley compelled Smalling to perform oral sex on Donald, then tortured, stabbed, and strangled Donald and beat both Donald and Smalling with a hammer. Donald was killed, but Smalling managed to escape and call the police. When the police found Marley, she *1126 confessed to killing Donald, but stated that she did not recall most of the attack, which Smalling said lasted between six and eight hours. Smalling believed Williams was present for the entire attack, but was unable to recall where he was for the majority of the incident. According to Smalling, at one point, Williams "beat and choked" her.
Defense counsel hired a clinical psychologist, Dr. Bart Ferraro, who diagnosed Marley with dysthymia, post-traumatic stress disorder, polysubstance abuse, and mixed personality disorder. He concluded that her problems stemmed largely from early childhood molestation by Donald. In his opinion, at the time of the crimes, she was not conscious of her actions due to post-traumatic stress disorder and dissociation. In his view, she met the criteria for an insanity defense. Marley did not file a notice of insanity defense as required by the Indiana Code.
On January 7, 1999, the State filed a motion in limine to exclude a videotape of Marley and Donald engaged in various sexual acts. The motion also sought to exclude Ferraro's testimony because Marley had not given notice of an insanity defense. Marley responded that the videotape established her dissociative state and that the doctor's testimony was admissible, not to support an insanity defense, but to rebut the mens rea element of murder. The trial court conducted hearings on the motions and denied the State's motion with respect to Ferraro's testimony, but determined that because Ferraro's-testimony related to mental disorders, in order to present it, Marley had to comply with the effects of battery statute, Indiana Code sections 35-41-1-8.3 and 35-41-3-11, which the trial court concluded requires a notice of an insanity defense. The trial court ruled that it would allow Marley to file her notice belatedly. The trial court also indicated that the videotape was inadmissible, but agreed to a continuance and took the motion under advisement.
On January 22, Marley filed her notice of intent to proceed with both self-defense and insanity as well as the defense of reasonable doubt with respect to mens rea and voluntariness. As required by the insanity defense statute, the trial court appointed two experts to evaluate Marley's mental condition. Both diagnosed Marley as suffering from a variety of mental disorders. On June 4, Marley filed a second notice of defense and argued that the trial court was violating her Sixth Amendment and Fourteenth Amendment rights by prohibiting her from admitting evidence of her relationship with Donald and her mental status to show lack of mens rea and | voluntariness without complying with the insanity defense. On July 1, the trial court held another evidentiary hearing on the State's motion in limine, reaffirmed its earlier ruling with respect to Ferraro's testimony, and ruled the videotape inadmissible.
Marley requested that the trial court certify the order for interlocutory appeal, which it did. The Court of Appeals affirmed the trial court's rulings. Marley v. State,
I. Effects of Battery Statute
A. Exclusivity
Marley first claims that, for a variety of reasons, she should be allowed to present her medical evidence as a defense to the mens rea or the voluntariness elements of the charged crimes. The trial court ruled that the evidence, including Ferraro's testimony, would be admissible only under the effects of battery statute, and that the *1127 statute incorporated the requirements for maintaining an insanity defense. This is an issue of first impression.
The effects of battery statute is found among the "defenses relating to culpability." It applies to a defendant who either (1) "raises the issue [of] not responsible as a result of mental disease or defect" (for convenience we refer to this as an "insanity" defense) 1 or (2) "claims to have used justifiable reasonable force" ("self-defense"), and, in conjunction with either, "raises the issue that the defendant was at the time of the alleged crime suffering from the effects of battery as a result of the past course of conduct of the individual who is the victim of the alleged crime." Ind.Code § 85-41-8-11 (1998).
Although not limited by its terms to battered women, the statute typically comes into play with respect to efforts to introduce evidence of battered women's syndrome in defense of a charge against the mistreated victim. It is far from clear from the language of this statute what it is intended to do. It does not explicitly limit the use of battered women's syndrome evidence to the self-defense and insanity theories. It imposes notice requirements on a defendant claiming self-defense, but has no comparable provision with respect to insanity. Presumably the absence of any notice requirement with respect to insanity is because the insanity defense statute has its own notice requirement. Id. § 35-36-2-1. Self-defense has no similar provision. The sum of this is that, although the statute states that it applies to an insanity defense, it has no substantive or procedural provisions with respect to insanity. Read literally, the statute does nothing with respect to insanity, and the reference to the insanity defense is surplusage.
The State contends that the statute was a legislative response to Barrelt v. State,
The inability to form a subjective appreciation of the effect of neglect of a dependant is within the literal terms of the insanity defense because it is a "severally abnormal mental condition" that "impairs [the defendant's] perception." As already observed, if the purpose of the 1997 legislation was to require that battered women's syndrome evidence be limited to self-defense and insanity, the language chosen is less than clear. Nev *1128 ertheless, we agree with the trial court that the statute is intended to have that effect, if for no other reason than it would otherwise be meaningless as to insanity. More importantly, the legislative response to Barrett suggests that the General Assembly considered the Barrett defense to be in the nature of an insanity defense as that is defined in the Indiana Code. Marley's claim is of the same sort,. and was therefore properly held subject to the insanity statute.
Marley's claim of a "dissociative state" as a result of battered women's syndrome, like Barrett's claim, is a claim that an abnormal condition has impaired the defendant's perception of the action taken. If the lack of knowledge or intent is attributable to a "mental disease or defect," which is the nature of Marley's evidence, it falls within the legislature's definition of the "insanity" defense and must be asserted accordingly. In this respect, Barrett is to be distinguished from MeClain v. State,
Limiting the admissibility of battered women's syndrome evidence in this manner is consistent with well established principles of Indiana law. Over one hundred years ago, in Sage v. State,
*1129
The effects of battery statute, Marley contends, has the effect of impermissi-bly shifting the burden of proof to her as to an element of the erime. Marley correctly points out that federal due process requires the State to bear the burden of proof on every element of a criminal offense. In re Winship,
Barring battered women's syndrome evidence as to a defendant's state of mind where the defendant has not complied with the insanity statute does not affect its admissibility for other purposes. For example, in Barrett, the Court of Appeals concluded that the defendant was "denied the opportunity to present evidence essential to her defense" when she was prevented from responding to prosecutor's questioning during opening and closing arguments as to why she remained with her abusive boyfriend. Barrett,
B. Bar Against Ex Post Facto Laws
Marley claims that the statute cannot apply to her without violating the United States and Indiana constitutional prohibitions against ex post facto laws. 3 Article
*1130 I, Section 24 of the Indiana Constitution provides that, "No ex post facto law ... shall ever be passed." The United States Constitution contains a similar provision in Article I, Section 10, clause 1.
An ex post facto law is retroactive in application. Weaver v. Graham,
[A)Iterations [to rules of evidence] which do not increase the punishment, nor change the ingredients of the offence, or the ultimate facts necessary to establish guilt, but-leaving untouched the nature of the crime and the amount or degree of proof essential to conviection-only remove existing restrictions upon the competency of certain classes of persons as witnesses, relate to modes of procedure only, in which no one can be said to have a vested right, and which the State, upon grounds of public policy, may regulate at pleasure.
Thompson v. Missouri,
Marley argues that the effects of battery statute deprives her of a battered women's defense that was recognized in Barrett,
C. The Application of the Statute to Marley and Donald as "Cohabitants"
The effects of battery statute requires the victim to be the abused individual's (1) spouse or former spouse, (2) parent, (38) guardian or former guardian, (4) custodian or former custodian, or (5) cobha-bitant or former cobhabitant. Ind.Code § 35-41-1-3.3(2). Because it is clear that the relationship between Marley and Donald was not among the first four criteria, the issue becomes whether they were "cohabitants or former cohabitants." Marley claims that the effects of battery statute does not apply to her because she and Donald were not "cohabitants" or "former cohabitants." The majority opinion in the Court of Appeals disagreed stating, "the legislature did not intend 'cohabitant' to necessarily mean a sexual partner, and, thus, Donald was a cohabitant as to Mar
*1131
ley." Marley,
"Cohabit" means "to live together as or as if a married couple." Merriam Wesb-ster's Collegiate Dictionary 228 (10th ed.1993). Black's Law Dictionary defines "cohabitation" as "[the fact or state of living together, especially as partners in life, usually with the suggestion of sexual relations." Black's 254 (7th ed.1999). The usual meaning of the term cohabitation thus implies at least a temporary life partner arrangement of some sort. This interpretation is further supported by the use of the terms "cohabit" and "cohabitation" in other contexts. See Ind.Code § 31-11-10-2; Id. § 831-16-14-1; Graves v. Graves,
At the time Donald was killed, the record does not support a "cohabitation" between Marley and her uncle Under some cireumstances an adult and a fourteen year old might be viewed as "cohabitants," but we need not address that question here. In this case, the trial court was confronted with evidence that a sexual relationship between Marley and Donald resumed when Marley was twenty-one years old and living with Donald. This is sufficient to support a relationship of "former cohabitants" as provided in the statute.
II. Admission of Videotape
Marley also claims that the trial court erred in ruling that a videotape containing over one hundred minutes of her and Donald engaged in a variety of sexual activities was inadmissible. The trial court's order stated:
The Court granted the Motion in Limine with respect to the video tape because of the following Rule 403 analysis: the defense could not lay a foundation for it; the defense could not authenticate it; we do not know the date the video tape was made, or the cireumstances of the sexual encounter; it would be distracting to the jury; and, it would cause an undue consumption of time.
Marley claims that the probative value of the tape is not substantially outweighed by the danger of unfair prejudice, and by not allowing her to present this evidence, the trial court is violating her Sixth and Fourteenth Amendment right to present a defense. The State counters that the trial court was acting within its discretion when it ruled that the videotape was inadmissible.
Trial courts are given wide latitude in Rule 408 rulings, and we review those determinations for an abuse of discretion. Ingram v. State, TIS N.E.2d 405, 408 (Ind.1999). The trial court held two hearings on the admissibility of the tape and heard extensive argument and evidence, including three expert witnesses on Marley's mental status. Marley argues that the tape is relevant and probative because it depicts the relationship between Marley and Donald, illustrates the doctors' testimony, corroborates Marley's testimony, and helps the jury understand dissociation. The State responds that doctors will be testifying at length about these con *1132 cepts at trial, and the sexually explicit tape would add very little to the jury's understanding of these issues. As the trial court pointed out, the cireumstances of the tape's creation are not established, so it is speculative whether it in fact demonstrates a dissociative state. Defense counsel also argues that the danger of unfair prejudice is little because the jury already knows about the abuse. In response, the State notes that the probative value is minimal because this information will be presented to the jury in a much less cireus-like atmosphere. Given that there will be testimony from expert witnesses on this point, we cannot, conclude that the probative value of a videotape containing over one and a half hours of explicit sexual footage would nee-essarily outweigh the potential juror distraction. In striking this balance under Indiana Evidence Rule 403, the trial court did not abuse its discretion when it ruled that the videotape was inadmissible.
We also find unpersuasive Marley's argument that her Sixth and Fourteenth Amendment right to present a defense is violated by the trial court's ruling on the videotape issue. Marley may present her self-defense and insanity defenses, bolstered by her battered women's syndrome evidence. This may include testimony from doctors concerning her claimed dissociation and other mental problems. Although the right to present a defense "is of the utmost importance, it is not absolute." Roach v. State,
Conclusion
The judgment of the trial court is affirmed. This case is remanded for proceedings consistent with this opinion.
Notes
. The defense we refer to in short as "insanity" is more precisely defined as being "unable to appreciate the wrongfulness of the conduct" as a result of "a severely abnormal mental condition that grossly and demonstrably impairs [the defendant's] perception." Ind.Code § 35-41-3-6 (1998). If such a defense is asserted the statute requires notice to the trial court, id. § 35-36-2-1, and places the burden of establishing the defense on the defendant by a preponderance of the evidence, id. § 35-41-4-1b).
. No separate claim is raised under the Indiana constitution and we express no opinion on any state constitutional issue.
. Although Marley did not raise this issue in the trial court, both she and the State agree that ex post facto violations constitute fundamental error that may be raised for the first time on appeal. Nuerge v. State,
