REPRESENTATIVE OR ASSISTANT must be ensured for the availability to take Alexander position.
As Alexander is an evidence custodian which is a very crucial responsibility that he has in his district, if there are certain times when Alexander will not be able to make certain commitments then it would be safe to say that Alexander can ask his representative or assistant for the same.
As an evidence custodian there must be a assistant or Representative to whom Alexander can turn at times like these where he can not travel to a conference scheduled to be next month. It is then the role of that particular representative or assistant to be at the conference at Alexander's stead and carry out the proceedings or deal with the matters at hand accordingly.