we wrote about kirk godum yesterday, prosecutors apologized to him, said he should be exonerated. he was convicted of a 1981 rape on the basis of his f.b.i. testifying that his hair was found in the victim's bed clothes. the victim six weeks after the case picked his picture out of a fa to array, and in talking about an unrelated matter thought he looked like the composite sketch. turned out dna testing showed it wasn't his hair. more precise testing showed that only one man could have left the stains recovered from the crime scene, that man was not kirk godum, he was a convicted sex offender, turns out. the examer and the prosecutor misstated or turned out to be in error. this is the third case of three different men who were implicated by three different f.b.i. hair agents that in the nation's capital, just 600,000 people, three men who were in prison between 20 and 30 years each on the basis of flawed evidence. >> woodruff: and quickly, the type of crimes we're talking about, murder, rape? >> hairs tend to be taken from violent crimes. like murder, like rape. the penalties invo