The Home Office has told me in a written answer that it does not collect statistics on the association between knife crime where people are killed or maimed. However, the serious violence strategy that was published last year tells us that in 57% of all homicides, either the victim or the offender is either a drug dealer or a drug user. The Secretary of State has asked Dame Carol Black to carry out an honest assessment of our capability and capacity to address this threat, but she is not allowed to consider whether we can take this threat out the hands of criminals altogether. The Americans learned a very hard lesson in the 1920s and 1930s when they prohibited the drug alcohol, and the entire world has learned a very hard lesson in the global war on drugs over the past 50 years. Why cannot we carry out an honest assessment of the costs and benefits of prohibition?