It is a defence to a prosecution of a registrable offender for an offence against section 58A (Offence—fail to report as required), in relation to a reporting obligation under section 42, if—
(a) circumstances make it impracticable for the registrable offender to make the report at least 7 days before leaving the ACT; and
(b) the offender makes the report at least 24 hours before leaving the ACT.