What are the key principles of a public health approach to crime in Trinidad and Tobago?

Seeking to prevent an issue for a population as a whole or a sub-population (e.g. women, minority communities, young people), and intervening early with at-risk groups to reduce the harm caused by the issue, including by promoting recovery and increasing community resilience.
Developing a detailed understanding of the nature, extent, and impact of an issue using shared data and intelligence.
Working with partners to coordinate tailored and targeted preventative action that, together, aims to provide:

a. Primary Prevention: Preventing an issue emerging in the first place or re-emerging by focusing on social determinants/the causes at a population (or sub-population) level.

Examples of primary prevention are:

Early years family or school-based interventions (E.g. The good behaviour game)
Training in social and emotional skills, problem-solving and anger management for at risk children. (E.g. Becoming a man programme; life skills programmes).
Increasing alcohol pricing and reducing availability (via policy, licensing, or trading standards action).

b. Secondary Prevention: Preventing an emerging issue from becoming an established problem.

Examples of secondary prevention are:

Drug diversion schemes that divert people away from criminal justice sanctions and toward psycho educational programmes and drug treatment.
Diversion from crime (E.g. Diverting young adults).
Mentoring

c. Tertiary Prevention: Preventing an established problem from getting worse and becoming a crisis, and mitigating the immediate impact of the problem:

Harm reduction – drug & alcohol treatment.
Mental health support.
Victim/offender mediation.
Restorative justice.

Assessing how well interventions are implemented, and how effective they are at preventing the issue for your population and/or reducing the harm to relevant groups.
Learning from the implementation and effectiveness of actions and making any changes that are necessary at an individual, organisation or system wide level.
Building leadership across public services and communities to work together to address an issue, its causes, and harms, by aligning strategy, leadership and resources.