I'm aware Oxford has a large homelessness problem, because I see/speak to/fall over evidence of it. I didn't see any crime, and only very occasionally heard anecdotal evidence of it every time I go out.

That didn't make sense, did it. It should have said:

I'm aware Oxford has a large homelessness problem, because I see/speak to/fall over evidence of it every time I go out. I didn't see any crime, and only very occasionally heard anecdotal evidence of it.