THIS EVALUATION IS BASED ON THE FOLLOWING TWO PROGRAM GOALS: (1) TO PROVIDE SUCCESSFUL TREATMENT AND REHABILITATION TO DRUG USERS AND (2) TO REDUCE SOCIAL COSTS OF ADDICTION THROUGH CONTROL. SPECIFIC AIMS OF THE STUDY WERE ACCOMPLISHED BY COMPARING GROUPS UNDERGOING THE NORMAL 7-YEAR COMMITMENT TO TREATMENT WITH GROUPS HAVING MINIMUM EXPOSURE TO THE PROGRAM. FOUR SAMPLES WERE DRAWN FROM THE MALE POPULATION: 1962-1963 ADMISSIONS VIA WRIT OF HABEAS CORPUS; 1964 ADMISSIONS; 1970 ADMISSIONS; AND 1964 ADMISSIONS DISCHARGED AS SUCCESSES. PARTICIPANTS WERE INTERVIEWED BETWEEN SEPTEMBER 1974 AND OCTOBER 1975 TO OBTAIN QUANTITATIVE DATA ON DRUG USE, EMPLOYMENT, AND ILLICIT BEHAVIOR AS A FUNCTION OF LEGAL STATUS FROM THE FIRST NARCOTIC USE TO TIME OF INTERVIEW. THE STUDY REVEALED THE FOLLOWING CONCLUSIONS: (1) THE CIVIL ADDICT PROGRAM SIGNIFICANTLY REDUCED DAILY NARCOTIC USE; (2) LASTING BENEFITS SUBSEQUENT TO DISCHARGE WERE INDICATED; (3) PRECOMMITMENT LEGAL STATUS AND BEHAVIOR DID NOT SEEM TO AFFECT SUCCESS RATES; (4) DIFFERENTIAL AVAILABILITY OF METHADONE MAINTENANCE RESTRICTED ANALYSIS; AND (5) DRUG DEALING AND CRIMINAL ACTIVITY ARE RELATED TO DRUG USE. TABULAR DATA, FIGURES, NOTES, REFERENCES, AND APPENDIXES CONTAINING SAMPLE SELECTION, INTERVIEW SCHEDULES, AND DATA COLLECTION PROCEDURES ARE PROVIDED. (JCP)