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Preston Decker began their career in 2006 as a Police Officer-Field Training Officer for the City of Sheridan. In 2015, they joined Blue Line Protection Group, Inc. as Vice President Operations.

Preston Decker obtained an Associates of Applied Sciences in Criminal Justice/Law Enforcement from Arapahoe Community College between 2002 and 2005. Preston obtained an Arizona Private Investigator License from the Arizona Department of Public Safety in October 2018, an Arizona Unarmed Security Instructor License from the Arizona Department of Public Safety in October 2018, a Nevada Private Investigator License from the State of Nevada in November 2017, a City of Denver Security Instructor License from the City and County of Denver in December 2016, a Colorado Private Investigator License from the Colorado Department of Regulatory Agencies in December 2016, a Denver Armed Guard License from the City and County of Denver in August 2015, a Colorado Marijuana Enforcement Division-Industry Employee License from the Colorado Department of Revenue in July 2015, an Instructor of Response to Bomb Threat and Terroristic Threats from the Department of Homeland Security, Office of Inspector General in October 2011, and a Field Training Officer from the National Association of Field Training Officers.