Everyone has the right not to be arbitrarily arrested or detained.
Liberty of the person is about not being locked up without good reason. No one can be detained arbitrarily.
This provision says everyone has the right not to be arrested or detained without proper legal authority. This means police must have a lawful reason to arrest or detain someone.
If the State locks you up, it must have a lawful reason and follow fair process. Random arrests or indefinite detention without trial are not allowed. You cannot be imprisoned just because someone dislikes you or because of your political views