Chief Instructor
Chief William Frederick Endler (Ret.) 

Chief Endler is a graduate of Indiana University and retired as a Detective from the Elkhart P.D. (IN).  During his 30-year law enforcement career he also served as Chief of Police for two law enforcement agencies before becoming a CVSA Instructor.  Prior to becoming a CVSA Examiner, Bill was a polygraph examiner and conducted hundreds of polygraph exams over a period of 17 years.  Bill is a Master CVSA Examiner and has established himself as one of the world’s premier CVSA examiners based on his expertise, experience and the assistance he has provided to law enforcement, military and government agencies worldwide.  Chief Endler also has the distinction of serving as the US Government’s Subject Matter Expert for the CVSA in Iraq, where he conducted numerous CVSA examinations of High Value Detainees and other individuals of interest.  Bill also conducted CVSA Certified Examiners Courses for the FBI and is certified as a CVSA Expert Witness by the US Federal Courts.

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. Harry Bennigson

Harry Bennigson is retired from the Vallejo Police Department (California) after 35 years in Law Enforcement. Harry started his law enforcement career with the Tiburon Police Department in 1979 before transferring to the Vallejo PD in 1988. In his career, Harry was a police officer, detective, FTO, Corporal, Sergeant, hostage negotiator, and traffic motor officer. While working investigations with Vallejo PD, Harry became a CVSA examiner in 1995. Harry has conducted well over 1,000 examinations, ranging from fraud to homicide. After retiring from Vallejo PD, Harry worked in retirement with the UC Berkeley PD, officer, and detective for six years. At UCPD, Harry solved a 22-year-old cold case homicide with the use of the CVSA. 

Lt. Ed Tapenes (Ret.)

Ed has been in law enforcement since 1999 and has served in a number of agencies to include the Miami-Dade P.D., and the Florida Division of Investigation and Forensic Services. Ed was certified as a CVSA Examiner in 2006 and has conducted over 700 criminal exams. Ed holds a Master’s Degree from Florida International University, is fluent in Spanish, and teaches our CEC’s in both the US and Latin America. Ed is also a Certified Instructor in a number of other law enforcement disciplines.