Complete Resolution of the Quantum Zeno Paradox for Outside Observers
  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. 
M. Hotta and M. Morikawa