Mescaline as a molecule is virtually worldwide an illicit substance. For mescaline containing cacti different regulations apply from country to country. In Switzerland, for example, Lophophora williamsii (Peyote) and Echninopsis pachanoi (San Pedro) since 2002 is regulated by narcotics law, while in Germany mescaline cacti are only counted as narcotics without medical or other benefits if the plant "is to be misused as a narcotic" as the text of the law says in the text. This is why cacti of every kind, mescaline cacti, may be both purchased, sold, transferred, possessed and cultivated - as long as the plants are not obviously intended for consumption. That is the only reason why you can buy Peyote and San Pedro at the market garden in Germany today. In Holland, the mescaline cacti are legal as well and can be traded, possessed, cultivated and shared. In the USA, since 1995, members of the indigenous church, the Native American Church, are allowed to use the psychoactive Peyote or a powder prepared from the buttons as a sacrament.