A search for hidden variables in the domain of high energy physics

The idea of hidden variable theories, which contests the notion of quantum mechanics being the fundamental principle of nature, is well known and seems to need no introduction. In 1966 such a theory (of a non-local character) was proposed by D. Bohm and J. Bub. We present a scheme in which measured decay processes may constitute an adequate substitute to the original test proposed in 1966 and which until now proved to be realizable only for massless particles. Finally, we consider a specific proposal concerning Tau decays. A preliminary overview of several experimental data sets is presented.