Beyond Zero Tolerance (or Zero Tolerance 2) is a FPS developed by Technopop for the Sega Mega Drive / Genesis. It was meant to be a sequel to Zero Tolerance, but it was never finished. Both games have been deemed by the (now defunct) developer to be publicly distributable as freeware. [Info from Wikipedia] You can download the playable beta of the game at Technopop memorial site. Huge props to the developers for sharing this piece of gaming history with the community!
Thanks to Celine for the contribution!