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Homeless, vagrancy, diminished capacity and what it means


The issue of homelessness is intricately connected with mental health and substance use disorders. According to the Substance Abuse and Mental Health Services Administration (SAMHSA), as of 2010, approximately 26.2% of all sheltered homeless individuals were found to have a severe mental illness, while 34.7% had chronic substance use issues. Among those experiencing chronic or long-term homelessness, around 30% have mental health conditions and 50% face co-occurring substance use problems​​.

The National Coalition for the Homeless reports that the range of substance use disorder among the homeless population varies, with about 38% of homeless individuals being alcohol-dependent and 26% dependent on other substances. The dual challenges of mental health disorders and substance abuse—often referred to as dual diagnosis or co-occurring disorders—make this a particularly vulnerable subgroup within the homeless population, requiring complex, multifaceted support and intervention strategies​​.

Furthermore, it's estimated that between 25-50% of the homeless population in the US suffer from a substance use disorder, showcasing the significant overlap between homelessness, mental health issues, and addiction​​. This data highlights the need for integrated treatment programs that address both mental health and substance use disorders simultaneously, providing a holistic approach to support individuals in overcoming these challenges and moving towards recovery and stable housing.


If its predictable, its preventable, if its preventable, and it was predictable, there is liability.

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SEAN A. AHRENS

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ean Ahrens, a security consultant and expert witness based in Chicago, Illinois.

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Expert Witness Security Consulting in Chicago

SEAN A. AHRENS, MA, CPP, CSC, BSCP, FSyl, CHPA

Years in Practice: 23

  • General Specialties: Security Management

  • Contact me to see my CV 

Fields in specialization focus: Workplace violence, armed assailant active shooter, operations alarm, surveillance, crime prevention through environmental design, commercial, retail, and hospitality.

Working as a current security consultant, I have current knowledge regarding current threats, and vulnerabilities for a myriad of building types: parking garages, apartment buildings, warehouses, bars, restaurants, entertainment, office, workplace violence and security technology, operations, and architecture. 

My focus is on premise liability, negligence, wrongful hiring, foreseeability, crime demographic analysis, benchmarking, physical security, and security management.

  • My education: I have a master's in organizational security management from Webster University, graduating with honors–Cum Laude. Before that, I did my bachelor's in criminal justice at Western Illinois University. I continue to obtain certifications that further substantiate my security lineage.

  • If you'd like to get in touch, please say hello through any of the social links above. You can also reach me through my employer AEIeng.com

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