I fit the description: I was between 5'3" and 5'11" and my skin color can be described as "coffee with a touch of milk."
Video evidence that showed, fifteen minutes before it happened, that I was 13km away at a wedding having dinner wasn't enough since I could have left immediately after the footage was taken and driven down.
I still have video evidence of the senior detective basically instructing the witness to select me out of a lineup. They also whispered to each other throughout which I only managed to hear thanks to some expensive headphones I had.
I made fake Facebook accounts and befriended all of the "witnesses" and victims. Beat the case on a technicality thanks to a post I found on Facebook by a eye witness.
I'd still be in jail right now 9.5 years later.
I'd say it happens extremely frequently, it's just that the people it happens to aren't as lucky as I am.