rspec mock_model model never restored

Question

I'm using rspec 1.3, and using rspec's mock_model to mock out some of the models in my controller tests. I create all the mocks in the before(:each) in the controller spec. I then run my model tests where I build real activerecord objects for setup in before(:each) instead of mocks. It seems that in my model tests, the model is still the mock. Why is the mock sticking around after the controller tests have already run?