An intoxicated police employee can never keep the community safe and secure, as mandated by law enforcement prescripts. However, limited attention is given to harmful or hazardous substance abuse or the binge drinking habits of police employees. Substance abuse being a ‘culture’ in law enforcement agencies and the maintenance of the blue wall of silence as a protective measure necessitates scientific research to explore how a collaborative working relationship between the occupational social worker and especially First Line Managers (FLMs) can contribute to addressing this phenomenon in a timeous manner. The researcher applied a quantitative research approach and utilised a switching replication quasi-experimental design to determine whether the collaborative working relationship between South African Police Service (SAPS) FLMs and Police Social Workers (PSWs) can be strengthened to the extent that they effectively and efficiently deal with the harmful or hazardous substance abuse or binge drinking habits of SAPS employees by exposing the FLMs to a social work intervention, namely the Sober Workplace Programme for Managers. The pre-, mid-, and posttest measurements are based on knowledge, attitude, and behaviour constructs to determine if the two hypotheses formulated were supported. The study, however, did not indicate that the Sober Workplace Programme for Managers strengthens the collaborative working relationship between the FLMs and PSWs to address the harmful or hazardous substance abuse or binge drinking habits of employees in the workplace. Alternative research and occupational social work strategies are recommended to establish if and how the Sober Workplace Programme for Managers can be implemented to strengthen the collaborative working relationship between the FLMs and PSWs to address the harmful or hazardous substance abuse or binge drinking habits of employees. / Social Work / Ph. D. (Social Work)