It is a defence to a charge of an offence against this Part involving a failure to comply with a requirement or request made by a workplace safety officer (including a requirement or request to answer a question or provide information) for the defendant to prove:
(a) that the officer did not, before making the requirement or request, identify him/herself to the defendant as a workplace safety officer by producing the officer's identity card or in some other way; or
(b) that the officer did not warn the defendant that failure to comply with the requirement or request would constitute an offence.