The Role Of Urf
Haram and halal are determined on the basis of the illat or cause, not urf. This cause a is something objectionable. An urf has to be changed if it is objectionable. For example, wine is an urf in the West. It is not acceptable. In the matters of sadd e zarya, and determining diyat, Haq e Mehr, etc, and in certain applications of an injunctions, urf is considered.