Non-Biological Parent Taking 17-Year-Old Across State Lines (MO → FL)

Generally, NO—a non-biological, non-adoptive parent cannot legally transport a 17-year-old across state lines without proper authorization. At 17, the minor is still subject to parental/guardian control in both Missouri and Florida.

Legal Framework

• Parental Rights: Only legal parents (biological/adoptive) or court-appointed guardians have automatic authority to decide a minor's residence and travel.
• Non-Parent: A step-parent, partner, or other adult has no inherent legal standing to consent to interstate travel for the child.
• Age 17: Not an adult (18 in both states). "Mature minor" doctrines apply to medical consent, not travel custody.

Exceptions (Where It Might Be Legal)

1. Court Order: Non-parent has legal custody/guardianship (e.g., via juvenile court, probate, divorce decree).
2. Written Consent: Both legal parents sign a notarized travel consent form authorizing this specific trip (dates, destinations, contact info).
3. Emergency: Immediate danger (abuse, medical) – but authorities must be notified ASAP.
4. Emancipation: Minor legally emancipated (court order; rare at 17).

Risks of Unauthorized Travel

• Parental Kidnapping / Custodial Interference (felony in MO & FL).
• AMBER Alert if parent reports missing.
• Interstate Compact on Placement of Children (ICPC) violations if relocation involved.
• Civil liability for the non-parent.

Action Steps

1. Obtain notarized consent from both legal parents (or sole custodial parent).
2. Carry: consent form, child's ID, insurance, medical authorization, your ID.
3. If consent refused/unobtainable: do not travel. Consult a family law attorney in MO (and FL if moving).

The 17-year-old's preference matters morally but not legally without court order. Protect yourself and the child: get paperwork.