  Chandrasekhar separated the Dirac equation for spinning and massive particles
in Kerr geometry into radial and angular parts. In the present review, we
present solutions of the complete wave equation and discuss how the Dirac wave
scatters off Kerr black holes. The eigenfunctions, eigenvalues and reflection
and transmission co-efficients are computed for different Kerr parameters. We
compare the solutions with several parameters to show how a spinning black hole
distinguishes mass and energy of incoming waves. Very close to the horizon, the
solutions become independent of the particle parameters indicating an
universality of the behaviour.
