(a) in doing or omitting to do that act the
employee was acting without the connivance or permission of the employer
or any such user;
(b) it was not under any condition or in any
circumstance within the scope of the authority of the employee to do or
omit to do an act, whether lawful or unlawful, of the character of the act
or omission charged; and
(c) all reasonable steps were taken by the
employer or any such user to prevent any act or omission of the kind in
question, the employer himself shall be
presumed to have done or omitted to do
that act, and shall be liable to be convicted and sentenced in respect
thereof; and the fact that he issued instructions forbidding any act or
omission of the kind in question shall not, of itself, be accepted as
sufficient proof that he took all reasonable steps to prevent the act or
omission.