@abc.abstractmethod<EOL><INDENT>def get_trust(self, agent_id):<DEDENT>
return<EOL>
Gets a trust level for the given agent.

        An ``Agent`` may be in one circle of trust that, in turn, is
        inside another circle of trust. To test whether an agent is
        inside a specific circle, use ``IsInCircle()``.

        :param agent_id: an agent ``Id``
        :type agent_id: ``osid.id.Id``
        :return: the trust
        :rtype: ``osid.authentication.process.Trust``
        :raise: ``NotFound`` -- ``agent_id`` is not found
        :raise: ``NullArgument`` -- ``agent_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*