Factories and Industrial Undertakings Ordinance

In a proceeding for an offence under a provision in this Ordinance consisting
                of a failure to comply with a duty or requirement to do something so far as is
                necessary, where practicable, so far as is reasonably practicable, or so far as
                practicable or to take all reasonable steps, all practicable steps, adequate steps
                or all reasonably practicable steps to do something, the onus is on the accused to
                prove that it was not necessary, not practicable or not reasonably practicable to do
                more than was in fact done to satisfy the duty or requirement, or that he has taken
                all reasonable steps, or practicable steps or done the appropriate thing to satisfy
                the duty or requirement.