  An experimentally realizable scheme is formulated which can test any
postulated quantum mechanical approach for calculating the arrival time
distribution. This is specifically illustrated by using the modulus of the
probability current density for calculating the arrival time distribution of
spin-1/2 neutral particles at the exit point of a spin-rotator(SR) which
contains a constant magnetic field. Such a calculated time distribution is then
used for evaluating the distribution of spin orientations along different
directions for these particles emerging from the SR. Based on this, the result
of spin measurement along any arbitrary direction for such an ensemble is
predicted.
