long as eight hours in emergency wards Canadian health-care workers found solutions for them in the U.S. Americans visiting Canada to receive healthcare Some U.S. citizens travel to Canada for healthcare-related mainly to access lower costs. Many U.S. citizens purchase prescription drugs from Canada, either over the Internet or by travelling there to buy them in person, because prescription drug prices in Canada are substantially lower than prescription drug prices in the United States; this cross-border purchasing has been estimated at $1 billion annually. Some states like Florida have signed bills to import prescription drugs from Canada but are awaiting federal approval. Because marijuana is legal in Canada but illegal in some of the U.S., many U.S. citizens with cancer, AIDS, multiple sclerosis, and glaucoma have travelled to Canada for medical treatment. One of those is Steve Kubby, the Libertarian Party's 1998 candidate for governor of California, who has adrenal cancer. Recent legalization of marijuana in some states of the U.S. has reduced this type of travelling. Portability and provincial residency requirements The Canada Health Act covers residents of Canada, which are persons "lawfully entitled to be or to remain in Canada who makes his home and is ordinarily present in the province, but does not include a tourist, a transient or a visitor to the province." When traveling within Canada, a Canadian's health card from his or her home province or territory is accepted for hospital and physician services. Each province has residency and physical presence requirements to qualify for health care coverage. For example, to qualify for coverage in Ontario, with certain exceptions, one must be physically present in Ontario for 153 days in any given 12-month period. Most provinces require 183 days of physical presence in any given 12-month period. Exceptions may be made for mobile workers, if the individual can provide documentation from his or her employer verifying that the individual's work requires frequent travel in and out of the province. Transients, self-employed itinerant workers (e.g. farm workers) who move from province to province several times within a year, and peripatetic retired or unemployed individuals who move from province to province (e.g. staying with various relatives, or living in a recreational vehicle) may find themselves ineligible for health coverage in any province or territory, even though they are Canadian citizens or landed immigrants physically present in Canada 365 days a year. "Snowbirds" (Canadians who winter in