The conditions for the independence of decays of the spin-1/2 resonances on
the production mechanism of the resonances and on polarizations of the incoming
and outgoing particles are derived and applied in the case of several
tau-lepton decays. The necessity for inclusion of the influence of the
production mechanism in the evaluation of the lepton flavour violating decays
is stressed.Comment: Invited Talk at the Seventh International Workshop on Tau Lepton
Physics (TAU02), Santa Cruz, CA, USA, Sept. 2002, 6 pages LaTeX; One typo
corrected, a note added, one reference adde
