Is it permissible for the legislator to prohibit second-degree consanguineous marriages, following the precedent of 'Umar (may Allah be pleased with him) forbidding Muslim men from marrying Kitābī women, and the Personal Status Law setting an age limit for marriage, in order to reduce genetic diseases resulting from consanguineous marriages?

Marriage between relatives is permissible according to Islamic law, and this is the most preponderant opinion among scholars, as there is no evidence to prohibit or even disapprove of it. Modern medical studies indicate a slight increase in the risks of hereditary diseases among relatives (7-8%) compared to non-relatives (5%), and they recommend premarital screenings instead of an absolute prohibition. Marriage between relatives also has positive aspects, such as preserving good hereditary traits within the family.