def create_security_policy_schema(self):
        public_role = settings.PUBLIC_ROLE
        schema = settings.POLICY_SCHEMA
        self._check_for_injections(public_role)
        self._check_for_injections(schema)

        query = 'CREATE SCHEMA IF NOT EXISTS %s AUTHORIZATION %s'
        params = (AsIs(schema), AsIs(public_role))
        return self.execute_sql(query, params)