Regarding Howard Wooldridge’s commentary, there is a middle ground between drug prohibition and blanket legalisation (The lives and trillions of dollars sacrificed on the altar of futile modern prohibition, Comment, November 15). Switzerland's heroin maintenance programme has been shown to reduce disease, death and crime by providing addicts with standardised doses in a clinical setting. Its success has inspired heroin maintenance pilot projects in Canada, Germany, Spain, Denmark and the Netherlands.

Expanding prescription heroin maintenance would deprive organised crime of a core client base. This would render illegal heroin trafficking unprofitable and spare future generations addiction. Cannabis should be taxed and regulated like alcohol, only without the advertising. As long as criminals control cannabis distribution, consumers will come into contact with sellers of hard drugs. Cannabis prohibition is a gateway drug policy.

Robert Sharpe, MPA

Policy analyst

Common Sense for Drug Policy

Washington, DC