With the exception of some policies in the 10s-20s allegedly targeting Chinese and Mexicans, that article doesn't really support the claim as applicable to the last 60 years.

That's because those are the most openly racist policies out there. At some point in history, it became harder to talk in the same racist terms as before.. Starting in the 60's.

And that makes things a bit fuzzy, unfortunately. Much harder to prove racist policies. And you wind up having to do a lot more digging and use examples. Think of the stereotypical crack dealer: That's from the 90's, if I remember correctly. We know the drug policies disproportionately affect minority communities and poor folks, yet numbers also tell us that addiction hits most levels of society. And have failed to change it. We didn't erase the racist-inspired laws either. To me, this sort of thing all stinks of. And I'm too cynical to think that suddenly, race had nothing to do with it.

Unfortunately, this sort of thing does little to prove any of it to a non-believer.

I'm not a non-believer. I'm neither a believer nor a non-believer. It certainly seems plausible, but I've seen a lot of conflicting evidence and arguments about law enforcement and race.