I would add that in addition to having to show the cost of any new checks that one should have to show how the check will actually prevent the problem it propos

I would add that in addition to having to show the cost of any new checks that one should have to show how the check will actually prevent the problem it proposes to prevent and the likely-hood of that problem occurring or re-curring. A major problem I've seen with checks is that they just become CYA material rather than anything truly beneficial or preventative and people will work around them.