As a practitioner, not a researcher, I can't speak across the board or for different communities. I can only tell you what I've read in the case law and with regard to the practice I have.
I can indicate from case law—and I'm certainly referring now to R. v. Neve as one of the cases that jumps to mind—that when we're looking at aboriginal offenders and other things and young women caught up in the system, Bill C-27 and the reversal of the onus would have a wholly detrimental effect on anyone who was in any way classically marginalized at the beginning of the process. Aboriginals, people of any kind of ethnicity, people who are not the linguistic majority in their communities, and anyone who's marginalized at the beginning is going to find themselves hopelessly lost when the onus is placed on them and they are acting and not reacting, with the balance of their lives as the stakes in the game.
I'm happy to send you any material I can find in respect to that first part.