STT Security & Investigations has been Nationally Headquartered in the Great Lakes Bay Region for nearly 50 years. STT Security & Investigations is the Great Lakes Bay Regions premier provider of: -Security Guard Services -Private Investigations -Surveillance -Executive Protection Personnel -Employee Discharge Support -Security Consulting & Surveys -Employee Background Checks -Employee Pre-employment Interviews -Embezzlement Detection -Covert & Undercover Operations -Drug Recognition Training -Threat Assessment Training -Firearms Training