The centrality of the principle of limiting narcotic and psychotropic drugs for medical and scientific purposes leaves no room for the legal possibility of recreational use. . . . Nations may currently be pushing the boundaries of the international system, but the pursuit of any action to formally legalize non-medical and non-scientific drug use would require either treaty revision or a complete or partial withdrawal from the current regime. The Dutch policy of keeping anti-drug laws on the books while limiting enforcement of certain offenses is carefully designed to reduce harm while still complying with the letter of international drug control treaties. This is necessary in order to avoid criticism from the International Narcotics Board, which historically has taken a dim view of any moves to relax official drug policy. In their annual report, the Board has criticised many governments, including Canada, for permitting the medicinal use of cannabis, Australia for providing injecting rooms and the United Kingdom for proposing to downgrade the classification of cannabis, which it has since done (although this change was reversed by the Home Secretary on 7 May 2008 against the advice of its own commissioned report). The liberal drug policy of the authorities in the Netherlands especially led to problems in "border hot spots" that attracted "drug tourism" as well as trafficking and related law enforcement problems in towns like Enschede in the East and Terneuzen, Venlo, Maastricht and Heerlen in the South. In 2006, Gerd Leers, then mayor of the border city of Maastricht, on the Dutch-Belgian border, criticised the current policy as inconsistent, by recording a song with the Dutch punk rock band De Heideroosjes. By allowing possession and retail sales of cannabis, but not cultivation or wholesale, the government creates numerous problems of crime and public safety, he alleges, and therefore he would like to switch to either legalising and regulating production, or to the full repression that his party (CDA) officially advocates. The latter suggestion has widely been interpreted as rhetorical. Leers's comments have garnered support from other local authorities and put the cultivation issue back on the agenda. In November 2008, Pieter van Geel, the leader of the CDA (Christian Democrats) in the Dutch parliament, called for a ban on the cafés where cannabis is sold. He said the practice of allowing so-called coffeeshops to operate had failed. The CDA had the support of its smaller coalition partner, the CU (ChristenUnie), but the third party in government, PvdA (Labour), opposed.