  Derivation and experimental violation of Bell-like inequalities involve the
measurement of in-compatible observables. Simple complementarity forbids the
existence of such joint probabilitydistribution. Moreover, the measurement of
incompatible observables requires different experimen-tal procedures, which no
necessarily must share a common joint statistics. In this work, we avoidthese
difficulties by proposing a joint simultaneous measurement experiment. We can
obtain theexact individual statistics of all the observables involved in the
Bell inequalities after a suitable datainversion. A lack of positivity or any
other pathology of the so retrieved joint distribution is then asignature of
nonclassical behavior.
