For example, if you're sitting in your living room with a bunch of other people, many of whom know each other, and two people start fighting, you are all witnessing a crime and you can also all identify the two people fighting. It would be ridiculous to require DNA evidence in that situation.
replyAt the same time though, a bunch of people who know each other and the people allegedly involved could very easily share the same incorrect testimony. You wouldn't believe in bigfoot if 5 guys drinking beers swore they saw him while they were camping. Sending someone to prison or worse is much higher stakes. DNA evidence might be too extreme, but I'd expect some sort of evidence to back up a testimony. "What if the witness was wrong" just seems like always a reasonable doubt, or at least the number of witnesses who would need to corroborate something such that it ceases to be a reasonable doubt is impractically high.
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