7.-(1) The standard test of knowledge is-
Did the person whose conduct is in issue know of the relevant circumstances or have no substantial doubt of their existence?
(2) The appropriate key words are-
(a) the verb "to know" in any of its forms;
(b) "knowledge" and "knowingly"; and
(c) any of the words mentioned in section 6 (2) above, if used so as to imply that the person whose conduct is in issue cannot intend to produce a particular result unless he knows some particular fact or facts.
Mental element
Knowledge - national proceedings
EDIT.