I doubt any other former (or current) president(s) will make this statement. Jimmy Carter writes in the New York Times:
In an extraordinary new initiative announced earlier this month, the Global Commission on Drug Policy has made some courageous and profoundly important recommendations in a report on how to bring more effective control over the illicit drug trade. The commission includes the former presidents or prime ministers of five countries, a former secretary general of the United Nations, human rights leaders, and business and government leaders, including Richard Branson, George P. Shultz and Paul A. Volcker.
The report describes the total failure of the present global antidrug effort, and in particular America’s “war on drugs,” which was declared 40 years ago today. It notes that the global consumption of opiates has increased 34.5 percent, cocaine 27 percent and cannabis 8.5 percent from 1998 to 2008. Its primary recommendations are to substitute treatment for imprisonment for people who use drugs but do no harm to others, and to concentrate more coordinated international effort on combating violent criminal organizations rather than nonviolent, low-level offenders.