We are using code review process for two reasons : First to check security issues and secondly to check source code quality. We are a team of 40-45 developers, some of them are new, some others have more experience and we don't want the young trainee wrongly accept the revision of another developer.
In the same way a developer cannot accept his own revision, it should be great to create a role "Reviewer" and that only people with this role can accept revisions.