The Post article says that "while many prosecutors made swift and full disclosures, many others did so incompletely, years late or not at all." The Post series that of all the forensic techniques to come out of crime labs, only DNA evidence has been scientifically validated and "able to consistently and accurately link a piece of evidence to a person or single source." Still unproven, but often used, are analyses of fingerprints, hair and fibers, marks on bullets and shell casing, handwriting and the use of polygraphs.

After a judge dismissed the case against Brandon Mayfield, the . The Frontline documentary also looks at other dubious uses of forensic evidence, from the testimony of a "smell" expert in the trial of Casey Anthony, who was acquitted of the first-degree murder of her 2-year-old daughter, to a story NPR reported last year on how flawed bite-mark identification was used to convict .

In an interview with airing Tuesday, Hsu tells host Audie Cornish that from the mid-1970s to the mid-1990s, "the FBI lacked written protocols and invoked highly subjective techniques" to conduct hair and fiber pigtail analysis.

And Tuesday night, forensic science comes under more scrutiny in a , working with ProPublica and the Investigative Reporting Program at the University of California, Berkeley. Their looks at how flaws in fingerprint analysis led to the of an Oregon attorney, who found himself on trial for participating in the 2004 terrorist bombings in Spain that killed 191 people.