アメリカ合衆国憲法修正第13条
The plaintiff asked the court to rule that the terms of the Thirteenth Amendment to the United States Constitution applied to Tilikum, and thus that the orca's confinement amounted to involuntary servitude or slavery. The court held that the Thirteenth Amendment only applied to persons and that Tilikum was not a person, and so was not afforded constitutional protections.