Our Staff - NITV Federal Services | The manufacturer of the 'Computer Voice Stress Analyzer' - CVSA


Chief Instructor
Chief William Frederick Endler (Ret.)
Chief Endler retired from the Elkhart P.D. (IN) following 23 years of service and has held the position of Chief of Police with two law enforcement agencies prior to joining our staff. His 30 years of law enforcement and established reputation as both a CVSA examiner and polygraph examiner make him a valuable asset to the company. Chief Endler also has the distinction of serving as a Subject Matter Expert on the CVSA in Iraq and the U.S. government where he conducted CVSA examinations on many High Value Detainees, receiving numerous letters of commendation for his outstanding work. Bill has also conducted Certified Examiners Courses on the CVSA for the FBI. Chief Endler is a graduate of Indiana University.

Senior Instructor
Commander Michael McQuillan (Ret.)
Mike has over 31 years of LE Experience with the Prince George’s County Police Department (MD) where he retired as Commander of their homicide division after earning a reputation as a preeminent homicide investigator. Mike’s vast experience conducting CVSA examinations, coupled with his teaching abilities in other law enforcement disciplines (homicide investigations, interviewing and interrogation, etc.), has made him a tremendous asset. Mike has the distinction of being the instructor for many of the Certified Examiners Courses conducted for the US military’s Special Operations personnel who deployed to Iraq. Mike also has the distinction of being the Senior Instructor for the Certified Examiners Courses conducted for the FBI. Mike has been a practicing voice stress examiner utilizing the CVSA since he graduated from the Certified Examiner’s Course in 1994.

Chief Howard Shook (Ret.)

Howard spent over 30 years in the law enforcement community, serving primarily with the Prince Georges County, MD, Police Department. He has extensive experience in a number of investigative disciplines, and specialized in homicide investigations for many years of his career. Howard has conducted hundreds of CVSA examinations including homicide, internal affairs, and background investigations, among others. Howard has also taught several specialized investigative courses within the law enforcement community during his career. Howard was certified as a CVSA examiner in 2002.

Det./Sgt. Osvaldo Ramos

Detective “Ozzy” Ramos has served with the Miami Beach Police Department for the past ten years, six in the Criminal Investigations Division where he has been instrumental in solving hundreds of high-profile cases. He is currently assigned to the Homicide Division where he was directly responsible for establishing the first Cold Case squad. Over his 15 years in the law enforcement profession, Ozzy has gained in-depth experience in numerous disciplines to include: truth verification, corrections strategies, interviews / interrogations techniques, and homicide investigations including crime scene management. Detective Ramos is bilingual and specializes in Spanish language instruction for our Latin American Training Division.

Det./Lt. Kenneth Merchant (Ret.)

Ken served over 25 years with the Erie Police Department in Pennsylvania and was the CVSA Unit Supervisor for the department. He has an extensive background in criminal investigations, to include homicide investigations, child abuse/child sexual abuse cases, and other major crimes. Ken has been a CVSA Examiner since 1999 and has conducted over 1,000 CVSA examinations, to include criminal cases background investigations and internal affairs cases. Ken is one of the many CVSA Examiners who solved a major case with the CVSA immediately following his training. After completing his training in 1999, Ken’s second CVSA examination involved a major homicide, which he was able to quickly solve through the use of the CVSA. Besides teaching his regular Certified Examiners Courses, Ken is NITV FS’s designated instructor for our dedicated Background Investigator/Pre-employment Certified Examiners Course.

Det. Alfred R. Boza (Ret.)

Al Boza served with the Miami Beach Police Department from 1972 – 2001 and upon his retirement he was immediately re-hired as a Background Investigator, a position he continues to hold. During his full-time tenure he was an Organized Crime Investigator and also served as a Public Information Officer (PIO). As a PIO, he conducted seminars for various Latin American law enforcement agencies. He trained as a polygraphist at the Department of Defense Polygraph Institute (DoDPI) under the tutelage of Ronald Decker, and received further training in the area of pre-employment investigations at the Zonn Institute of Polygraph. Investigator Boza is also a Certified CVSA Examiner and has used the CVSA exclusively since 2003. He has conducted several thousand CVSA and polygraph pre-employment examinations, and is considered an authority in the area of Pre-Employment investigations. Al is bilingual, and is a Spanish language instructor for NITV Federal Service’s Latin American Division.

AIS Instructor
Sgt. Robert M. Wall (Ret.)
Bob served 28 years with the Saanich P.D. (Canada), the last eight-years in the Major Crimes Unit. Bob also served three years with the National Criminal Intelligence Service and has vast experience in the field of Interviewing and Interrogation. Bob’s specialty is teaching our Analytical Interview System course. Bob was certified as a CVSA examiner in 2004.

AIS Instructor
Sgt. Don Wiebe (Ret.)
Prior to joining our staff, Don served 30 years with the Saanich Police Dept., in British Columbia, Canada, with the last 10 years in the Major Crimes Unit. He is an accredited Team Commander for the Province of British Columbia. Don also served as the only Canadian Certified Instructor for the Kinesic Interviewing Technique and has taught that technique throughout the law enforcement community in Canada and the U.S. Don has acted as an expert in the area of determining deception for the Providence of British Columbia Legal Services. Don is currently a practicing CVSA examiner and has conducted more than 1,000 examinations in all areas of investigation. Don was certified as a CVSA examiner in 2002.