Canadian immigration laws concerning mail-order brides have traditionally been similar to (but slightly less restrictive than) their U.S. counterparts; for instance, previously not requiring the Canadian citizen to prove minimum-income requirements (as has been a long-standing requirement of United States immigration laws). While there is still no formal requirement for a minimum salary, the sponsor must provide evidence of income (such as the T4 income tax slip from an employer) with their IMM 5481 Sponsorship Evaluation. Until 2001 Canada's immigration policy designated mail-order brides under the "family class" to refer to spouses and dependents and "fiancé(e)" class for those intending to marry, with only limited recognition of externally married opposite-sex "common law" relationships; same-sex partners were processed as independent immigrants or under a discretionary provision for "humane and compassionate" considerations. In 2002, the Canadian Immigration Law was completely revised. One of the major changes was conjugal partner sponsorship, available for any two people (including same-sex couples) who have had conjugal relations together for at least one year. Canadian immigration authorities frown upon conjugal-partners sponsorship for heterosexual couples, and now require the couple to marry before a visa is granted (unless serious reason can be demonstrated why the couple is not yet married).