Sure, absolutely.
I'm beginning to conduct some research on this aspect. I've spoken with people who have been working since the 1980s—after the police killing of Anthony Griffin in 1987 in Montreal, for example. There was a massive community outcry, and what happened afterwards was a promise to have better training with the police. Many Black women and Black community organizers at that time took part in police training. Of course, throughout the 1990s we continued to see an acceleration of police killings of Black people.
As well, after the allegations and systemic evidence came out about policing of indigenous communities in Montreal, again the Native Women's Shelter provided training for the police. Later they went to the media, decrying the way that they were treated by the police; and of course we continue to see it as an ongoing issue.
All of this, as well as evidence based in the United States, suggests that diversity training and all of these other forms of training, while perhaps well intentioned, are not actually effective in addressing the realities of racial profiling, of police killings, of gender-based violence and all the other issues that are at the heart of the problem.