for clandestine graves and to recover evidence and to recover bodies from those graves. >> for necrosearch, the starting point was the braided hair that was believed to be from michelle wallace. forensic plant ecologist vicki trammell looked for any plant material that was in the hair. >> the hair had spent five years outside most likely being drug around by scavengers like coyotes. so my question was not so much where is the body, because i had no way of determining that, but where had the hair spent five years? >> the lack of soil in the hair suggested the body had not been buried. >> the hair wasn't muddy and there was bleach marks. in other words, bleached by the sun in the places that were exposed. and that would not have happened had the hair been buried for five years.