Yes. If you know someone has a lawyer, you deal with his lawyer, period.
From the BC Code of Professional Conduct:
6.02 (6) Subject to subrule (7), if a person is represented by a lawyer
in respect of a matter, another lawyer must not, except through or with
the consent of the person�s lawyer:
(a) approach, communicate or deal with the person on the matter; or
(b) attempt to negotiate or compromise the matter directly with the
person.
6.02 (7) A lawyer who is not otherwise interested in a matter may give
a second opinion to a person who is represented by a lawyer with respect
to that matter.
Commentary
Subrule (6) applies to communications with any person, whether or not a
party to a formal adjudicative proceeding, contract or negotiation, who
is represented by a lawyer concerning the matter to which the
communication relates. A lawyer may communicate with a represented
person concerning matters outside the representation. This subrule does
not prevent parties to a matter from communicating directly with each
other. The prohibition on communications with a represented person
applies only where the lawyer knows that the person is represented in
the matter to be discussed. This means that the lawyer has actual
knowledge of the fact of the representation, but actual knowledge may be
inferred from the circumstances. This inference may arise when
there is substantial reason to believe that the person with whom
communication is sought is represented in the matter to be discussed.
Thus, a lawyer cannot evade the requirement of obtaining the consent of
the other lawyer by closing his or her eyes to the obvious.
Subrule (7) deals with circumstances in which a client may wish to
obtain a second opinion from another lawyer. While a lawyer should not
hesitate to provide a second opinion, the obligation to be competent and
to render competent services requires that the opinion be based on
sufficient information. In the case of a second opinion, such
information may include facts that can be obtained only through
consultation with the first lawyer involved. The lawyer should advise
the client accordingly and, if necessary, consult the first lawyer
unless the client instructs otherwise.