6A. Detention order not to be invalid or inoperative on certain grounds

that the person to whom it relates—

was immediately before the making of the detention order detained in any place other than a place of detention referred to in subsection 6(2);

continued to be detained immediately after the making of the detention order in the place in which he was detained under section 3 before his removal to a place of detention referred to in subsection 6(2), notwithstanding that the maximum period of such detention under subsection 3(2) had expired; or

was during the duration of the detention order on journey in police custody or any other custody to a place of detention referred to in subsection 6(2); or

that the detention order was served on him at any place other than the place of detention referred to in subsection 6(2), or that there was any defect relating to its service upon him.