Per Rihanna/ Brown what happens in assault cases if the victim refuses to testify?

Here, at any rate, they will now prosecute anyway and don’t need the victim’s co-operation.

Thats what they say now. We’ll see. The second part of the OP is if they can be successful. That is harder. I have never seen it happen. I’m sure it has happened somewhere but not during my decade of police work.

And it’s all her fault she was assaulted, too:

Source: http://www.boston.com/news/local/massachusetts/articles/2009/03/13/many_boston_teens_surveyed_say_rihanna_is_at_fault_for_assault/