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October 20, 2008

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Dear Mr Bratton:

Perhaps in the process of researching this problem you have learned enough about isolating DNA from forensic samples to understand that the reason there is a backlog of sexual assault cases, while there is not a backlog for mouth swabs, is due to the technical difficulty of obtaining pure male DNA from a vaginal swab. I mention mouth swabs (or buccal swabs as we call them in the business) because these are obtained from each felon leaving prison and DNA is made from these swabs and profiled. Crime labs are processing millions of mouth swabs each year and there is no backlog problem because the process of obtaining pure DNA from a mouth swab is easy. Vaginal swabs taken from rape victims are much more difficult because these swabs have lots of contaminating DNA from the victim that must be removed before the sperm DNA from the rapist can be profiled. It is the process of removing the victim's DNA that is so tedious and costly, and there simply are not enough qualified technicians in the crime labs to do the work, even if the money were available (which it sounds like it is).

A number of people in this field, including myself, are working on new ways to process vaginal swabs that reduce the amount of labor involved. I recently submitted a paper to the Journal of Forensic Sciences (the official publication of the American Society of Forensic Sciences) describing such a method and the paper has been peer reviewed and accepted for publication. I can give you a pre-print if you like. This paper shows that the contaminating DNA can be removed by selectively degrading it, rather than physically removing it the way it has been done in the past. If this new method works as well in crime labs as it does in my research lab, the sexual assault backlog will be solved by a technical advance that reduces the cost and more importantly the labor involved in making pure sperm DNA from a vaginal swab by a factor of 10 or more.

BY the way, I am an LA native (from Santa Monica) now working in Switzerland and I have been following the LA backlog problem closely. Is there anyone that you met in the crime labs that I can talk to about my new method?

Thanks, Alex Garvin

One of the major reasons there is a backlog of DNA cases is the huge amounts of money being spent on "Auditing" for the Consent Decree. Civilian Auditors are making large amounts of overtime, while major felony cases slip away, with suspects getting a free ride. The victims are forgotten by a Department that is more into political correctness than solving crime. Maybe the salaries and overtime of the auditors should be audited.

Why the findings regarding LAPD stops will always be suspect.

LAPD stop data is derived from the Field Data Report (FDR) and there has been a fatal flaw in this Report since its creation, resulting in data that cannot be trusted for statistical application.

The purpose of requiring officers to record stop data was to determine if racial bias was being applied during detentions, searches and arrests. Officers are required to record the perceived race of the person they detain at the time they initiated the detention. This is where the problem of bad data begins. There are many instances where a detention occurs before the officer has any idea of the race of the detained individual. This is most often the case with traffic stops. However, the FDR has no place for "unknown." Consequently, the race of the person detained has to be entered for these cases where it was not known until the detention had already occurred and the officer was able to meet with the detained person. It is unknown how often this occurs, but it is significant. For stop data to be accurate, these situations where the officer was unaware of the person's race must be recorded. Right now they are being recorded inaccurately and consequently the data is flawed from the very beginning.

Another area the public may not be aware of is the many times when stop data is required for actions beyond the control of the officer. I'm specifically referring to radio calls where the officer is responding to a call for service that was assigned. All calls for service require the same FDR be completed. The only exceptions are: homicide, rape, robbery, assault, domestic violence, shots fired, suspect with a knife or gun, kidnapping, bomb threat, child in danger of physical harm caused by another, officer needs help or assistance and battery.

This results in many FDR's where the officer has no choice with whom he or she interacts with, detains, or arrests.

It is unfortunate that no media source has been reporting this information so the public would better understand the many inherent problems of the FDR program that costs the City millions but returns only controversy based upon research that would not withstand academic scrutiny. That's probably why years ago when this first started, several nationally recognized mathematicians declared the entire program so fatally flawed as to be scientifically worthless.

How about agreeing the king has no clothes and using the money for DNA testing of those 7000 rape kits!



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