Amy Dorsey (Amydorsey)
Post Number: 2
|Posted on Wednesday, April 25, 2012 - 09:51 am: ||
We always do dna first and then we process for prints. We take samples from areas least likely to yield latents but most likely to yield DNA. Our medical examiners office says some chemicals will destroy potential DNA. Not all but some. So we do it prior to processing.
Graham Ford (Grahamf)
Post Number: 3
|Posted on Wednesday, April 04, 2012 - 11:35 pm: ||
"Yes you can recover DNA after ninhydrin treatment. Not just for blood marks but for latent marks as well. You need to do a P/C extraction to remove any chemical residues though. There are potential contamination issues but these can be minimized with proper controls"
"I know at the very least STR typing is still possible after Ninhydrin processing"
"CHEMICAL ENHANCEMENT OF FINGERPRINTS IN BLOOD: AN EVALUATION OF METHODS, EFFECTS ON DNA, AND ASSESSMENT OF CHEMICAL HAZARDS
Dr. J.D. DeHaan, J.D. Clark, T.F. Spear, R. Oswalt, S.S. Barney, CA Department of Justice, Bureau of Forensic Services, Sacramento, California
Bare in mind that these transfers are buckets of DNA vs low copy no samples... But there are a few articles on the web that point to it still being successful..
Ninhydrin treatment as a screening method for the suitability of swabs taken from contact stains for DNA analysis
K. Anslinger, U. Selbertinger, B. Bayer, B. Rolf and W. Eisenmenger "
The above comments are from another site.
Post Number: 2
|Posted on Wednesday, April 04, 2012 - 07:13 am: ||
Do you look for DNA or fingermarks first? Are chemical treatments that damaging to potential DNA present?