Trudeau vows ‘concrete action’ after discovery of 215 bodies at former residential school site Other First Nations are calling for a full investigation into all residential schools and their burial policies as promised in the Truth and Reconciliation Commission report.“This really speaks to the need for Canada to put in place a proper framework to address the issue of mass graves, unmarked or unrecorded deaths, and to follow what the survivors have been saying for some time,” said Mary Ellen Turpel-Lafond of the UBC Indian Residential School History and Dialogue Centre.If a decision is made to exhume at the site, it would start with establishing a perimeter of the gravesite through ground-penetrating radar.