 The fact that an assumption of this sort is needed for the analysis of experiments of this type was made clear by toy models constructed by Pearle (1970) and Clauser and Horne (1974). In these models, the rates at which the photon pairs pass through the polarization analyzers with various orientations are consistent with an inequality of Bell’s type, but the hidden variables provide instructions to the photons and the apparatus not only regarding passage through the analyzers but also regarding detection, thereby violating the fair sampling assumption. Detection or non-detection is selective in the model in such a way that the detection rates violate the Bell-type inequality and agree with the quantum mechanical predictions. Other models were constructed later by Fine (1982a) and corrected by Maudlin (1994) (the “Prism Model”) and by C.H. Thompson (1996) (the “Chaotic Ball model”). Although all these models are ad hoc and lack physical plausibility, they constitute existence proofs that theories satisfying the local causality condition can be consistent with the quantum mechanical predictions provided that the detectors are properly selective.