According to Perez,
out of 189 Touch DNA cases analyzed by the Marion County crime lab in 2008,
police were able to obtain full and partial offender DNA profiles in 48% of those cases, compared to just a 5 percent success rate from fingerprints.
http://www.buscovoice.com/2010/01/2...for-reducing-indiana-gun-and-burglary-crimes/
He says investigators submitted evidence for testing without considering what would work best. Analyses of doorknobs and other common surfaces yielded multiple or partial genetic profiles that often did not advance investigations.
Marone's labs began requiring more specific requests. Touch DNA tests have steadily increased in the past year, and he says they are yielding better results.
Ramsey developments
Like Cordle, Boulder District Attorney Mary Lacy learned about touch DNA at a conference.
Within weeks of the August 2007 gathering, sponsored by the Justice Department, prosecutors decided to consider new testing in the Ramsey case, a statement by the Boulder district attorney's office says.
Williamson, who supervised the Ramsey testing at Bode, says analysts spent hours with Boulder authorities to review evidence gathered 12 years earlier.
Evidence supported the "likelihood" that JonBenet's attacker removed her clothing and then redressed her, the statement says. Analysts scraped the waist areas of long johns JonBenet had on when her body was discovered in the basement of her home Dec. 26, 1996. Williamson says
they were able to retrieve enough cells to produce an unidentified male profile.
The findings did not resolve the murder, but they excluded the 6-year-old's parents and brother. Lacy cleared the family and apologized for the suspicions that made their lives "an ongoing living hell."
http://www.usatoday.com/tech/science/2008-09-22-touchdna_N.htm
I believe you would like to insert the words 'partial', 'degraded', or 'unusable' inbetween 'male' and 'profile', right? But isn't that writing your own news?
In April, after Progovitz had resubmitted the case to a private lab in Virginia, she got a different kind of call.
The lab had pulled a complete profile from clothing at the scene using touch DNA. It matched the DNA of the suspect whom police had in mind since rape, 12 years ago.
http://standdown.typepad.com/weblog/2008/09/touch-dna.html
Some touch DNA samples, however, do not qualify as
LCN samples in that they contain sufficient DNA for routine
conventional analyses
http://www.bioforensics.com/articles/CMJ_50(3)_BUDOWLE_19480017.pdf
Touch DNA -- using genetic material from skin cells left on an item -- is analyzed just like that from blood or semen. It's typically collected by scraping an object or placing tape on it, then lifting the tape up. The technique, in use for four or five years, gained some prominence this summer when it was used to exonerate the parents of JonBenet Ramsey, said Angela Williamson, director of forensic casework at Bode Technology, a Lorton-based DNA lab.
http://www.washingtonpost.com/wp-dyn/content/article/2008/09/21/AR2008092102276.html
I think you get the idea.