Evidence Act 1983.
Among other things, this Act provides that only male witnesses are judicious witnesses.  It also provides that one way the offence of fornication may be proved when there are not witnesses is by the husband repeating his testimony as to the fact of adultery five times, on the fifth time calling for Allah to curse him if he is lying.  Criminal Court Circular 97/83 of 24 November 1983 specifically requires that witnesses be male Muslims.
D000349:Africa; D000352:Africa, Northern; D001519:Behavior; D003906:Developing Countries; D004467:Economics; D005114:Extramarital Relations; D007514:Islam; D007878:Legislation as Topic; D008877:Middle East; D011287:Prejudice; D012067:Religion; D012725:Sexual Behavior; D012940:Social Problems; D012959:Socioeconomic Factors; D013397:Sudan; D014933:Women's Rights
Africa; Arab Countries; Behavior; Developing Countries; Economic Factors; Extramarital Sex Behavior--legal aspects; Islam; Laws And Statutes; Northern Africa; Religion; Sex Behavior; Sex Discrimination--legal aspects; Social Discrimination; Social Problems; Socioeconomic Factors; Sudan; Women's Status--legal aspects