  Clifton’s argument uses 8 (or 13) observables, fixes a value of one of them (Sx) and derives a HV prediction at variance with a QM prediction for a second one (Sx′). Hence, if a state can be produced where the QM system definitely has value v(Sx)=0 the predictions can be tested empirically. But fixing such a state experimentally is not an easy matter. So Clifton’s argument depends on a state that may be difficult to produce or isolate. Recently, a construction of 13 observables has been found that allows for a state-independent statistical argument (Yu and Oh 2012).