Expert Evidence | Davidson Cahill Morrison LLP

Paul Cahill to Present at OTLA Spring Conference 2026 on Surgical “Never Events” and Recognized Complication Cases

Davidson Cahill Morrison LLP May 4, 2026

Proving surgical negligence means proving what happened behind the closed doors of an operating room, often with no independent witnesses and operative notes written hours later. At the OTLA Spring Conference 2026, Paul Cahill presents on the difficult line between surgical “never events” and “recognized complications,” and why outcome alone is never enough to establish liability.

Rule 53.03 and Opposing Late-Filed Expert Reports

Hudson Chalmers June 2, 2025

A March 2022 amendment quietly raised the bar for litigants who serve their expert reports late. Where the old rule granted leave almost as of course, the party at fault must now show a reasonable explanation and the absence of uncompensable prejudice or undue delay. Three years of Ontario rulings show the courts taking the change seriously, which makes opposing a late report a tactic well worth considering.

Hudson Chalmers Judges Western Law’s Medical Malpractice Moot Trial

Hudson Chalmers March 4, 2025

On February 25, 2025, Hudson Chalmers volunteered as a judge at Western Law’s Medical Malpractice Moot Trial, organized by Legate Injury Lawyers and the Western Health Law Association. The hypothetical turned on whether an emergency physician met the standard of care in a delayed stroke diagnosis. He reflects on advocacy, expert evidence, and this year’s exceptionally strong students.

Navy Davidson Cahill Morrison LLP title card reading "Filing a Complaint Against an Ontario Doctor," labelled Medical Malpractice Patient Guide, from dcmlaw.ca.

How to Make a Complaint Against a Physician to the College of Physicians and Surgeons of Ontario (CPSO)

Paul Cahill July 20, 2024

In Ontario, a complaint to the College of Physicians and Surgeons (CPSO) and a medical malpractice lawsuit are two separate paths that do different things: one holds a doctor to account, the other seeks compensation. This guide explains how the CPSO complaint process works, what the College can and cannot do, the possible outcomes and your review rights, and how a complaint differs from a claim.

Can I Sue for Medical Malpractice in Ontario?

Paul Cahill May 4, 2024

Anyone can start a medical malpractice lawsuit in Ontario, but very few succeed. Drawing on two decades representing patients against doctors and hospitals, Paul Cahill explains what you have to prove, whether a claim actually punishes the doctor, how long you have to sue, what it costs, what it is worth, and how long it takes.