Criminal Investigation Section

The Criminal Investigations Division is comprised of criminal investigators who are involved in general investigations ranging from criminal damage to homicide, they also have sub-specialties with specialized training in the following areas: investigate homicide, attempted homicide, aggravated assaults, deaths with suspicious circumstances, and armed robberies. Detectives utilize all available resources and investigative techniques to solve crimes, track down and apprehend suspects, accomplices and fugitives.

Sex Crimes / Child Crimes / Domestic Violence

These investigators are assigned to the department’s Domestic Violence Response Unit. They investigate any crime of domestic violence that have aggravating circumstances and work in conjunction with the prosecutor’s office to bring the case to a successful conclusion. These Investigators are also assigned to several Domestic Violence Task Forces that combat domestic violence.

The San Luis Police Department Sex Crimes Detectives investigate indecent exposure, public sexual indecency, sexual abuse, and sexual conduct with a minor, sexual assault of adults & children, sexual assault with a spouse, molestation of a child, possession of child pornographic material and sexual exploitation of minors under the age of 18.

Both of these websites are update constantly and offer the best information to people who want to conduct research on sexual offender and or crimes against children.


Nigel Reynoso

Lieutenant Nigel Reynoso was born in San Luis, Mexico and has been a resident of San Luis, Arizona since 1988. He has served the community as a Police Officer for the City of San Luis Police Department since 2005.

Lieutenant Reynoso currently serves as the Support Services Lieutenant overseeing the following: Criminal Investigation Division, School Resource Officers/School Operations Division, Training Unit and the department’s evidence room. Lt. Reynoso formerly supervised the following: Patrol Division, Canine Unit, Traffic Enforcement Unit, and Animal Control Service Unit.

Lieutenant Reynoso is a graduate of the Northwestern School of Police Staff and Command (SPSC) Class 441 and graduated from the University of Phoenix with a Bachelor of Science in Criminal Justice Administration. He is also a graduate of the Arizona Peace Officer Standards and Training Board (AZPOST) Arizona Leadership Program (ALP) Class 21 and has completed the FBI Law Enforcement Executive Development Association’s leadership schools, and became a recipient of the FBI-LEEDA Trilogy Award.

Lieutenant Reynoso serves as a member of the Yuma County Drugs & Delinquency Coalition. He served in the United States Marine Corps for 8 years and was honorably discharged as a sergeant.


Alan Guevara

Sergeant Guevara began his career as a Communications Officer in 2004. After graduating from the AWC Law Enforcement Training Academy in 2011, he was appointed as a Police Officer for the San Luis Police Department.

Sergeant Guevara’s previous assignments include being assigned as a supervisor for the Crime Suppression Unit (CSU) as well as supervisor assigned to a patrol squad. Sergeant Guevara is a certified AZ POST General Instructor, was certified as an Emergency Medical Technician (EMT) and Tactical EMT.  Sergeant Guevara has also served as a Field Training Officer, Bike Patrol Officer, and was a member of the Special Enforcement Unit (SEU). He has previously served as a Volunteer Program Coordinator, Reserve Program Liaison and Citizens Academy Liaison.


Paulino Lara


Carlos Pacheco


Cesar Gaitan