The Refugee Convention is the only major human rights treaty that is not externally supervised. Under all of the other key UN human rights accords — on the rights of women and children, against torture and racial discrimination, and to promote civil and political, as well as economic, social, and cultural rights — there is at least some effort made to ensure that States are held accountable for what they have signed onto.
Hathaway, James C. "Why Supervise the Refugee Convention?" Talk Back: Newsl. of Int'l Council of Voluntary Agencies (ICVA) 3, no. 5 (2001): 12-3.