This report provides a cost-benefit analysis of a program that provides publicly-funded treatment and support for persons who are addicted to alcohol or other drugs and who are judged to be indigent, unemployable, and incapacitated due to their addiction. The study focused on two client outcomes: (1) determine employment outcomes during an 18 month follow-up period; and (2) analyze whether public service costs incurred by treated clients decreased after treatment, giving rise to a potential cost-avoidance effect of public investment in chemical dependency treatment. Data were derived from clients' case records and from persons eligible for the program but who received no treatment. Some of the key findings included positive employment outcomes in which more clients became substantively and continually employed after treatment than did non-clients--even more gained jobs after extra vocational training; a favorable cost avoidance effect of treatment for a majority of clients, with the cost avoidance impact of treatment being largest among younger clients and among clients without mental health problems; and a mortality rate among regular clients that was 5.7 times higher than the general population of the same age and gender. Seven appendices supply methods and statistical models. Contains 38 references. (RJM)