  The quantum Zeno paradox is fully resolved for purely indirect and incomplete
measurements performed by the detectors outside the system. If the outside
detectors are prepared to observe propagating signals of a decay event of an
excited state in the core region, the survival probability of the state is not
changed at all by the outside measurements, as long as the wavefunction of the
signals does not have reflectional-wave contributions going back to the core by
the outside detectors. The proof is independendent of the decay law of the
survival probabilities. Just watching frequently from outside (observation)
cannot be regarded as a measurement which yields the quantum Zeno effect.
