As far as I know, we've learned from our mistakes.
Our colleagues at the Public Health Agency of Canada have been very rigorous in implementing these lessons to plug some of the safety loopholes that existed. To the best of my knowledge, these practices no longer exist.
On the other hand, the very nature of espionage and counter-espionage work means that the more useful and effective our tactics and techniques for understanding and gathering intelligence become, the more our adversary changes techniques to make our task even more difficult. So it really is a game of cat and mouse. We can't sleep soundly thinking it's all settled. That's why I always talk about partnership and dialogue between national security experts, like those at CSIS, and the organizations, because the situation, techniques and methods of espionage are evolving.
So we have to evolve at the same time.