A person is involved in a contravention if, and only if, the person:
(a) has aided, abetted, counselled or procured the contravention; or
(b) has induced, whether by threats or promises or otherwise, the contravention; or
(c) has been in any way, by act or omission, directly or indirectly, knowingly concerned in, or party to, the contravention; or
(d) has conspired with others to effect the contravention.