  We discuss the decays of the lightest scalar top quark $\tilde{t}_1$ in the
Minimal Supersymmetric extension of the Standard Model and show that the final
state $b\tau \nu_\tau \chi_1^0$, where $\chi_1^0$ is the lightest
supersymmetric particle, can be dominant in a significant area of the parameter
space, in particular in the high $\tan \beta$ regime. We then analyze the
prospects for discovering relatively light scalar top quarks accessible at the
Tevatron Run II in the $b\tau$ and missing energy channel.
