  We consider necessary and sufficient conditions for photons emitted from the
vicinity of a Kerr black hole horizon to escape to infinity. The radial
equation of motion determines necessary conditions for photons to reach
infinity, and the polar angle equation of motion further restricts the allowed
region of photon motion. Unlike emission from the equatorial plane, the latter
restrictions are crucial for photon escape when the initial polar angle of the
emission point is arbitrary. We provide a visualization tool to analyze these
two conditions and demonstrate a procedure for revealing photon escape.
Finally, we completely identify the two-dimensional impact parameter space in
which photons can escape.
