IIRC, during the David Westerfield trial, it was gleaned from one of the crime forums, to check the length of the hair/s found in DW's home/trailer because Danielle had just had her haircut only a day or two before she was taken and murdered. Often times ideas or thoughts from 'real people', those that would be making up a jury, both the defense and prosecution find to be handy as to what kinds of questions and concerns the jurors might have during deliberations. Sometimes for professionals, it's hard to see the forest for the trees.