Legal representation in even simple matters can lead to unintended consequences.  As an Example  H & J Restaurant v, A & J Grand Enterprises and Leigh, 2009 Slip OP 21544, authored by Justice Edmead, demonstrates how a simple ministerial mistake can end up with a potential $ 400,000 loss, with later judgment against the attorney. 

It’s a simple transaction

Criminal law and legal malpractice law seldom intersect.  One reason is an almost complete ban on criminal defendants suing their defense attorneys.  In order to sue, one must show "actual innocence" which is customarily demonstrated by reversal upon appeal or exoneration.  Since that is a rare occurrence, there is little vitality to criminal defense legal