Events
The Fundamentals of Drug Investigations
The Fundamentals of Drug Investigations delivers practical instruction and real-world strategies for every stage of a case — from target identification and case initiation to investigative planning, timelines, covert and overt tactics, informant acquisition and management, and prosecutorial considerations.
Seating is limited — join the list today to secure your spot.
This course will be held in the North Texas area in March 2026. The exact date and venue will be announced soon.
Take advantage of our early registration rate of $199 available through February 1, 2026.
After that date, the standard tuition will be $249 per student.
To be added to the early notification list for this course, please email calvin@sentineltraininggroup.org.
This course is taught by two highly experienced instructors — see their credentials below.
Sgt Gregory Garcia
26-Year Law-Enforcement Veteran | Federal Task-Force Supervisor
Det. Jay Darst
24-Year Law-Enforcement Veteran | Organized Crime & Narcotics Specialist
COURSE TOPICS:
- Target ID: Who we’re looking at and why it matters
- Case Initiation: How to launch a solid investigation
- Planning & Timelines: Set strategies and keep cases moving
- Covert & Overt Tactics: Building probable cause the right way
- Informant Management: Your best asset — and biggest challenge
- Prosecutorial Prep: Wrap it up and deliver accountability
- … AND MUCH MORE!
Narco Culture: Understanding and Identification
Closing Segment: Gun Interview – A Strategic Investigative Method for Solving Shootings
Description
This course provides law enforcement professionals with a comprehensive understanding of modern narco culture and its impact on gang identity, violence, and criminal enterprise. Participants will learn how drug trafficking groups influence local gangs, how cultural symbolism and regalia connect to cartel networks, and how to recognize operational indicators in the field.
The class concludes with Gun Interview: A Strategic Investigative Method to Solving Shootings — a proven, tactical interview approach designed to help investigators obtain critical intelligence, identify shooters, and connect weapons-related cases through behavioral cues and relationship mapping.
Course Information
Location: Arlington, Texas
Date: April 2026 (Exact date and venue to be announced)
Tuition:
Early Registration: $199 (available through February 1, 2026)
Standard Registration: $249 after February 1, 2026
Verification: Law enforcement credentials required. Payment confirms registration; access granted after agency/ID confirmation.
To be added to the early notification list for this course, please email calvin@sentineltraininggroup.org.
Topics Covered
Narco culture and its influence on U.S. gangs and street organizations
Common symbols, language, regalia, and behavioral indicators of narco influence
The overlap between cartel networks, gang structures, and local distribution crews
Investigative techniques for linking narcotics activity to organized violence
Integrating intelligence from field contacts, social media, and informants
Conducting the Gun Interview — extracting actionable intelligence in firearm-related investigations
Techniques for connecting firearms, suspects, and gang affiliation
Case examples demonstrating successful implementation of the Gun Interview method
INSTRUCTOR: Oscar Carrasco
A Seasoned Law Enforcement and Security Professional with 26 years of experience in criminal investigations, gang enforcement, and high-level interagency collaboration. Built a distinguished career with the Dallas Police Department, specializing in gang intelligence, undercover operations, and federal task force assignments, including significant contributions to FBI-led operations targeting transnational criminal networks. Recognized for leadership, tactical expertise, and a relentless commitment to public safety, earning multiple “Officer of the Year” honors and over 70 commendations. Served as a Task Force Officer with the FBI, contributing to major conspiracy cases and leading operations involving surveillance, wiretaps, and warrant service. Proven instructor and mentor, having trained law enforcement personnel across Texas in gang culture, proactive policing strategies, and officer safety. He continues to be a Dallas Police Reserve officer who is assigned to the Gang Unit.
