There’s no practical way for a defense lawyer to find out what the error rate is for, say, a state lab. Occasionally organizations can do this, for example the

There’s no practical way for a defense lawyer to find out what the error rate is for, say, a state lab. Occasionally organizations can do this, for example the innocence project figured out that the FBI’s hair analysis was bogus for decades (https://www.fbi.gov/news/press-releases/fbi-testimony-on-microscopic-hair-analysis-contained-errors-in-at-least-90-percent-of-cases-in-ongoing-review https://www.fbi.gov/news/press-releases/fbi-testimony-on-mic...).