Jamaica has one of the highest homicide rates in the region, and the dominant response is enforcement: police, prosecution, incarceration. Enforcement is necessary, but on its own it treats violence as a problem of bad individuals to be removed, one at a time, after the harm is done. The evidence from cities that have driven violence down points to a different and complementary understanding: violence behaves like an infectious disease. It clusters in specific places and networks, it spreads by contagion — one act of violence raises the probability of the next — and, like an epidemic, it can be interrupted.
This is not a metaphor for its own sake; it changes what the intervention is. If violence spreads by contagion within identifiable networks, then interrupting transmission — detecting the events most likely to trigger retaliation and intervening before they do — prevents the next act rather than punishing the last. Public-health violence interruption works alongside enforcement, targeting the spread that enforcement, acting after the fact, cannot reach.
This paper reframes violence as a public-health contagion problem, sets out how interruption complements enforcement, and offers four recommendations to the Ministry of National Security and the Ministry of Health and Wellness for a dual strategy that treats violence as both a crime and an epidemic.
Epidemiology observes three things about an infectious disease: it clusters rather than spreading evenly, it transmits from case to case, and its spread can be interrupted by breaking transmission. Violence exhibits all three. It concentrates heavily in specific communities and social networks; an act of violence sharply raises the probability of retaliatory violence in the same network; and the chain of retaliation can be broken if someone intervenes before the next act occurs.
Seeing violence this way does not excuse it or replace accountability — it adds a second front. Enforcement removes offenders after harm; interruption prevents the harm by breaking the transmission chain before the next act. The two are complementary: enforcement addresses the individual case, interruption addresses the contagion. A strategy that uses only enforcement is treating an epidemic with arrests alone, attending to each case after infection while the transmission continues unchecked.
Jamaica's violence response is weighted toward enforcement after the fact and light on interruption before it. The contagion — the retaliation that follows an act of violence through an identifiable network — is largely unaddressed, so the chain continues from case to case. Without a public-health interruption capacity working alongside enforcement, the strategy can remove offenders indefinitely while the spread that generates new offenders runs on.
Violence concentrates in known places and networks. Mapping where and among whom it clusters — as an epidemiologist maps an outbreak — directs interruption effort to the small share of places and relationships that generate the large share of harm.
The core intervention is detecting the events most likely to trigger retaliation and intervening — through credible community-based interrupters — to break the chain before the next act. This is the step that prevents violence rather than responding to it.
A small number of individuals are at greatest risk of being involved in violence, as victim or perpetrator. Focused support — changing their trajectory through opportunity, mentoring, and services — is the equivalent of treating the most infectious cases, and it is where prevention effort yields most.
Interruption does not replace enforcement; it complements it. The two must be coordinated as a single dual strategy — enforcement holding offenders accountable, interruption breaking the contagion — so that neither front leaves the other's gap unaddressed.
The Ministries should map where and among whom violence clusters and transmits, directing interruption effort to the places and networks that generate most of the harm rather than spreading it across the whole population.
Establish a public-health violence-interruption capability — credible community-based interrupters who detect likely retaliation and break the chain before the next act — working alongside, not instead of, enforcement.
Direct intensive support at the small number of individuals at greatest risk of violence, changing their trajectory — the prevention equivalent of treating the cases most likely to spread the epidemic.
The Ministry of National Security and the Ministry of Health and Wellness should run enforcement and interruption as a single coordinated strategy, so that accountability and contagion-breaking reinforce rather than substitute for each other.
Jamaica cannot arrest its way out of an epidemic. Enforcement is essential and must continue, but violence that clusters, transmits, and spreads by retaliation is behaving like a contagious disease, and a disease is not defeated by removing sick individuals one at a time while transmission runs on. The complement enforcement lacks is interruption: mapping the clusters, breaking the retaliation chain before the next act, and treating the highest-risk cases before they spread.
A dual strategy — enforcement for accountability, public-health interruption for contagion — is how the cities that reduced their violence actually did it. Human Intelligence LLC is prepared to support the Ministry of National Security and the Ministry of Health and Wellness in mapping the contagion and designing the interruption capacity this strategy requires.