 The next principle is in conflict with what we presented above as an alternative possibility to Dretske’s interpretation of the evidential structure of CP. Dretske’s counterexample works, we said, only if CP holds that whatever justifies the subject in believing p is also what justifies her in believing q. But there are two other possibilities. Maybe the evidential relation is reversed: whatever justifies us in believing q justifies us in believing p. Or maybe, we said, p itself, and not whatever justifies us in believing p, justifies us in believing q. The next principle goes directly against this possibility: