cannot say "nude", "topless", "girls" or similar words. The sign can only have the bar's name and terms like "cabaret" or "gentlemen's club". Strip club advertising and its associated controversy are not limited to the United States. In South Africa, well-known strip club chain Teazers generated media coverage and official complaints to the Advertising Standards Authority of South Africa (ASA) over its suggestive billboards. Law and politics The legal status of strip clubs has evolved over the course of time, with national and local laws becoming progressively more liberal on the issue around the world, although some countries (such as Iceland) have implemented strict limits and bans. Strip clubs are frequent targets of litigation around the world, and the sex industry, which includes strip clubs, is a hot button issue in popular culture and politics. Some clubs have been linked to organized crime, which has been known to use legitimate business as fronts for its illegal operations. Americas With the legal system of the U.S. based on common law, motivations for lawsuits can range from legitimate legal grounds to cases filed with the intent of shaping case law to favor the socio-political aims of special interest groups. Clubs around the country have personnel and clientele that are purported to engage in not only sex acts on the premises, but also drug use and other criminalized activities. Incidents of such activity vary widely. Their prevalence is dependent on regional differences in the attitudes of management, entertainers, customers, and law enforcement. Strip clubs are obligated to enforce age limits for entry to the clubs and consumption of alcohol. If a club is found to have served a person under the age of 21 alcohol it can have its liquor license suspended or rescinded for repeated violations. Licenses can also be lost due to evidence of drug use in the club. Club owners have closed their businesses as a result of losing a liquor license. A widely cited U.S. local ordinance is San Diego (California) Municipal Code 33.3610, specific and strict in response to allegations of corruption among local officials, which included contacts in the nude entertainment industry. Among its provisions is the "six-foot rule", copied by other municipalities in requiring that dancers maintain a six-foot distance from patrons while performing. Fully nude clubs may be subject to additional requirements, such as restrictions on alcohol sales and no-touch rules between customers and dancers.