Zero Tolerance is a FPS developed in 1993 / 1994 by Technopop and published by Accolade for the Sega Mega Drive / Genesis. Megalol noticed that in Sega Power magazine from september 1994 the screenshots in the game’s review are actually from a beta version. Infact, you can notice a couple of small differences in the HUD (name of the weapons in different place, ID card) and Level textures.
Beta Version:

Final Version:

Beta Version:

Final Version:

A sequel, Beyond Zero Tolerance (or Zero Tolerance 2) was in development by the same team, but it was never finished.
Images:
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U64 is an archive with articles, screens and videos for cancelled, beta & unseen videogames. Every change & cut creates a different gaming experience: we would like to save some documents about this evolution for curiosity, historic and artistic preservation.