jm + forensics   3

FBI admits flaws in hair analysis over decades
Wow, this is staggering.
The Justice Department and FBI have formally acknowledged that nearly every examiner in an elite FBI forensic unit gave flawed testimony in almost all trials in which they offered evidence against criminal defendants over more than a two-decade period before 2000. [....]

The review confirmed that FBI experts systematically testified to the near-certainty of “matches” of crime-scene hairs to defendants, backing their claims by citing incomplete or misleading statistics drawn from their case work. In reality, there is no accepted research on how often hair from different people may appear the same. Since 2000, the lab has used visual hair comparison to rule out someone as a possible source of hair or in combination with more accurate DNA testing. Warnings about the problem have been mounting. In 2002, the FBI reported that its own DNA testing found that examiners reported false hair matches more than 11 percent of the time.
fbi  false-positives  hair  dna  biometrics  trials  justice  experts  crime  forensics  inaccuracy  csi 
april 2015 by jm
BBC News - The hum that helps to fight crime
'Dr Harrison said: "If we have we can extract [the hum of the mains AC power's 50Hz wave] and compare it with the database, if it is a continuous recording, it will all match up nicely. "If we've got some breaks in the recording, if it's been stopped and started, the profiles won't match or there will be a section missing. Or if it has come from two different recordings looking as if it is one, we'll have two different profiles within that one recording." In the UK, because one national grid supplies the country with electricity, the fluctuations in frequency are the same the country over. So it does not matter if the recording has been made in Aberdeen or Southampton, the comparison will work.'
buzz  hum  uk  mains  power  50hz  crime  forensics  bbc 
december 2012 by jm
Body By Victoria - Secure Computing: Sec-C
Dr. Neal Krawetz brings the science on detecting Photoshop retouching
pixels  images  forensics  jpeg  photoshop  fake  analysis  detection  from delicious
december 2009 by jm

Copy this bookmark:



description:


tags: