Solving San Francisco's crisis of homelessness requires a sweeping, costly plan for housing and treatment - and political unity that has been missing for two decades

Naloxone could be the secret to curing New England's heroin consumption. Trying to expand access to the life-saving overdose antidote is the real obstacle.

Two columns on how Iran averted a major AIDS epidemic through needle exchange programs; a conservative theocracy is successfully treating drug abuse as if it were Amsterdam.

Colombia has attempted to decrease murder and homicide rates by setting up curfews for teenagers, forcing bars to close earlier in the evening, and creating gun laws to prevent the carrying of weapons. As a result of this epidemiological, data-driven approach, along with other governmental factors, the homicide rate has decreased significantly in most of the cities in which it was implemented.

Although Nigeria "is arguably the worst-run of the world’s major countries," it's biggest city is providing a model for how to turn poor governance around. Lagos, a historically fragile city like the rest of Nigeria, has devolved more power to civilian rule, which has shown positive results for the health of the city.

At least 25 percent of female veterans were sexually abused in childhood, making it more difficult to reenter civilian life. Volunteers of America runs a holistic housing program for homeless veterans in the U.S.

While critics argue that Naloxone isn't safe for over-the-counter use, some cities have found success distributing Naloxone to community members to help save lives of addicts who overdose. Naloxone can be administered to help those overdosing survive and jump-start the withdrawal process.

The California prison system is overwhelmed after adopting tough-on-crime laws with no improvement. New York adopted more tolerant policies and has decreased the state's crime rate and its prison population.

About 40 percent more people in the state are seeking treatment for addiction today than a year ago - but the number of deaths from heroin is going up. Local government is scrambling for both funding and awareness to combat the issue.

In Vermont, a judge and a family services organization created RapidReferal – a process which offers addicts treatment immediately and has lowered recidivism. Funded by Medicaid, the program has had demonstrable impact, namely, a decrease in recidivism.

South Dakota’s “24/7 Sobriety” initiative breathalyzers tens of thousands of people every day in an effort to curb drunk driving. Rather than legislation that takes penalizes offenders by taking away their license, the state addresses the behavioral issue instead. In counties that use the “24/7 Sobriety,” they’ve seen a 12% decrease in repeat drunken-driving arrests.