 One can show that weakly non-conspiratorial common cause explanations of EPR correlations satisfying surface locality are possible. But strongly non-conspiratorial, hidden local common cause explanations of EPR correlations are ruled out (Hofer-Szabó et al. 2013: 152, 163). These results show that the EPR correlations cannot be regarded as strictly empirical evidence against the Common Cause Principle because the type of common causes that can be ruled out have features by assumption that are not empirically testable (hidden locality and no-conspiracy)—they are metaphysical in character.