The consent of a member may be evidenced in any manner specified in writing in an operating agreement, but in the absence of a specification, consent must be evidenced by a written instrument, dated and signed by the member.
However, the assignee is not obligated for liabilities of which the assignee had no knowledge at the time the assignee became a member and that could not be ascertained from a written operating agreement.
IC 23-18-6-4.1