There was a series of murders in the north of England maybe 25 years ago that went unsolved. When DNA testing became available, the police essentially browbeat every male within plausible distance to be tested. They did solve the case. I'd have thought such questions would have been raised then, and perhaps they were.
Particulary interesting to me is the fact that the initial mass screening did not find the perpetrator, because he had paid somebody to give a sample for him. But he was eventually caught because the stand-in couldn't (or didn't want to) keep a secret.
Wikipedia mentions no controversy, although of course that doesn't mean there wasn't one.
