Is it permissible for the ruler to determine the amount of blood money (diyah) to be paid by the family of the killer?

Question:
He says: Honorable Shaykh, may Allah grant you success, does the ruler have the authority to determine the blood money (diyah) and obligate the family of the killer to pay it?

Answer:
Allah has determined the blood money (diyah) with a specific limit; the ruler has no say in it, nor does anyone else. The blood money is fixed. As for the determination of the blood money, yes, if Allah wills, the determination of the blood money is…