| Author | Message | ||
     Amy Dorsey (Amydorsey) Member Username: Amydorsey Post Number: 2 Registered: 04-2012 |
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) Member Username: Grahamf Post Number: 3 Registered: 08-2010 |
"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.. SHORT COMMUNICATION 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. | ||
| Exnsy (Exnsy) Member Username: Exnsy Post Number: 2 Registered: 04-2012 |
Do you look for DNA or fingermarks first? Are chemical treatments that damaging to potential DNA present? |
