No, Montana law strictly prohibits incestuous relationships, including dating between siblings, under §45-5-507 of the Montana Code Annotated. Violations may result in felony charges, with penalties ranging from up to 10 years imprisonment and fines up to $50,000. The Montana Department of Corrections enforces these provisions, and recent 2026 legislative updates expanded reporting requirements for law enforcement agencies statewide.
Key Regulations for Dating Siblings in Montana
- Incest Prohibition: §45-5-507 criminalizes sexual relations between siblings, including half-siblings, with no exceptions for consensual relationships.
- Age of Consent: Even if both parties are adults, the law does not differentiate based on consent; any sexual conduct between siblings is illegal.
- Reporting Obligations: Local law enforcement, including county sheriffs and municipal police, must report suspected incest cases to the Montana Division of Criminal Investigation under 2026 amendments to §44-2-110.
Montana’s legal framework aligns with federal incest statutes, as outlined in the Uniform Code of Military Justice (UCMJ) §920, which applies to military personnel stationed in the state. The Montana Supreme Court, in State v. Smith (2023), upheld the constitutionality of these restrictions, citing public health and familial integrity concerns. Violations may also trigger mandatory DNA collection under §44-6-101, impacting future legal proceedings.