New fingerprinting technique detects prints on weapons that have been wiped . Police in Texas using technology to investigate unsolved killing of woman in 2007 . `` I feel very optimistic . Technique shows metal fatigue to be caused by heat .
New fingerprinting technique detects prints on weapons that have been wiped . Police in Texas using technology to investigate unsolved killing of woman in 2007 . Technique shows metal fatigue to be caused by heat .