Southwestern Association of Forensic Scientists
Southwestern Association of Forensic Scientists Southwestern Association of Forensic Scientists

2011 Election - 2011

2011 Election

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President Elect Photo
Alex Madrigal 
Forensic Scientist IV
Texas Department of Public Safety
McAllen, Texas
Forensic Scientist IV

DNA/Serology Analyst and Crime Scene

(I have also trained in blood spatter, hair, fibers, and blood alcohol)

22 years of forensic experience

I have been or am part of the following organizations throughout my career

  • ASCLD/LAB Inspector 2001,DNA Auditor 2001, TX DPS Criminalists Association –1999, TX DNA Advisory Board 2000 – 2003, TX DNA Advisory Board 1996 – 1998, Association of Forensic DNA Analysts and Administrators (AFDAA) 1995, International Association of Bloodstain Pattern Analysts 1994, Association of Crime Scene Reconstruction 1994, Southwestern Association of Forensic Scientists 1990, American Society of Clinical Pathologists 1989
SWAFS Activities: Regular Member since 1990, have served on the Professional Conduct Committee, co-hosted the 1993 and 1998 SWAFS Meetings at South Padre Island, TX

OBJECTIVE: SWAFS has been a very important professional organization in the development of Forensic Scientists, not only in the scientific aspect, but in the enrichment of ethical values. We as SWAFS members have always taken pride in these values. Although, we at SWAFS always talk about Ethics, we need to bring in this kind of workshops to our meetings. With the rapid changes in forensics, we need to re-emphasized “ETHICS” in our work place. If elected I would like to bring workshops on Ethics to our meetings. Older or new Forensic Scientist, we can all benefit from workshops like this.

Secondly we need to continue to provide the latest up to date training that is available to SWAFS members and it’s guests.

Thank you; and I hope to serve your organization, SWAFS.
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Treasurer Photo
Steve Valdez 

Scottsdale Police Dept. Crime Lab
Scottsdale, Arizona
Steven R. Valdez
Scottsdale PD Crime Lab
BS Chemistry, 1986
Tucson PD Crime Lab 1987-1998
Scottsdale PD Crime Lab 1998-present
Areas of work: firearm/toolmark, controlled substances, blood/breath alcohol, fire debris
Southwestern Association of Forensic Scientists (SWAFS) history:
  • Member 1989-present
  • Nominating committee 1997-98, 2000-present
  • Board of Directors 1998-2000
  • Distinguished member 2000-present
  • President 2003-2004
  • Chairman of the BOD 2004-2005
  • Treasurer 2009-present
  • Zotter award recipient 2002

On running for treasurer: I’ve been the SWAFS treasurer for 2 years now. I’m just now starting to comprehend the flow and necessities of the position and would appreciate being elected back for another 2 years. Our Insurance is paid, our tax returns are filed, and our finances are secure and constantly monitored. Thank you.
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BOD Photo
Tamara Dallabetta-Keller
South Central Laboratory
Dallas, Texas
My name is Tamara Dallabetta-Keller and I am a senior forensic chemist with the Drug Enforcement Administration South Central Laboratory. I began my career as an intern with the Arizona Department of Public Safety North Regional Crime Laboratory in Flagstaff, AZ in 1995. After graduating from Northern Arizona University, I moved to Dallas to work with the DEA in 1997. I am certified by the American Board of Criminalistics as a Drug Analysis Fellow. I married my college sweetheart, Justin Keller, and we have three growing boys…Logan (8), Brody (4), and Cooper ( 7 months). I have been active within SWAFS since college and I have enjoyed many positions in the organization. I would be honored to again serve on the Board of Directors.
BOD Photo
Roger Metcalf 
Director of Human ID Laboratory

Tarrant County Medical Examiner
Forth Worth, Texas
Roger D. Metcalf, D.D.S., J.D. is the Director of the Human Identification Laboratory at the Tarrant County Medical Examiner’s District in Fort Worth, Texas. After graduating from Baylor University and Baylor College of Dentistry, Roger practiced general dentistry in the Arlington, Texas, area for 27 years before retiring from clinical practice to join the Medical Examiner’s office as a full-time employee in 2004. The Human ID Lab includes a full-time forensic anthropologist, a full-time latent fingerprint examiner, and Dr. Metcalf is the full-time forensic odontologist. The Lab processes about 320 to 340 unidentified remains cases per year for the District.

Roger received his forensic odontology training at the University of Texas Health Science Center at San Antonio Dental School in the Fellowship program in forensic odontology. He also received the J.D. degree from Texas Wesleyan University School of Law in Fort Worth, and Roger is a Diplomate of the American Board of Forensic Odontology. He participated in identification of victims of the Delta 191 and Delta 1141 plane crashes at D/FW International Airport, and of the victims of the Mount Carmel/David Koresh incident near Waco, Texas. He is a Fellow of the American Academy of Forensic Sciences (ad hoc Amicus Brief Committee), a member of the American Society of Forensic Odontology (secretary), and is on the Certification & Examination Committee, the ad hoc Proficiency Exam Committee, and chairs the ad hoc 2nd Opinion Committee of the American Board of Forensic Odontology. He is a Lieutenant Colonel in the 214th Medical Brigade of the Texas State Guard. He has been married to Linda Metcalf, PhD, for 37 years and they have three grown children.

“I am very honored to be nominated to run for a position on the Board of Directors. I am relatively new to the SWAFS, but I pledge I will work hard for the Association and do my very best to provide effective representation for the members, if elected. I have been very fortunate to have been associated with some very fine instructors of great skill and integrity, and they instilled in me a sense that it is important to ‘give back’ to the community, and I believe one excellent way to do this is by participating in and serving in our professional organizations. There are several outstanding candidates, so--PLEASE VOTE! Thank you very much for allowing me the opportunity to run for the Board.”
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Derek Sanders 
Pasadena Regional Crime Lab
Pasadena, Texas
I have been in Forensics for over twenty years. My fields of emphasis have been controlled substances, toxicology and breath testing. In that time, I believe I have carved out a reputation for competent work based on sound scientific principles. With that being said, our field has seen dramatic change over the past decade with the most relevant change still to come. I have not necessarily agreed with the direction the field has moved; however, I am prepared to weigh all viewpoints while serving on the board to make sure any recommendations are thoroughly vetted. If elected, I promise to reflect on the founders’ visions for the organization and act accordingly based on honesty, integrity and rational decision making.