That’s where the DA of Hennepin County and AG come into play. Unfortunately that will take time and this is something neither of them will get wrong. Worst case scenario they are able to find obstruction.
From my understanding the BCA did not “give up.” They have literally been prevented from accessing the scene, they have been prevented from acquiring any gather material, etc. They could not get access independently and can only request joint investigation.
Keith Ellison is damn good at his job. Let him cook.