BZ Gas

The BZ Gas is a special thrown weapon featured in Grand Theft Auto V.

Grand Theft Auto V
It is essentially a non-lethal version of the Tear Gas, based on the, a non-lethal incapaciting agent developed in 1951 and later used by the United States Military, whose NATO designation is BZ. However, it still takes the form of a  (specifically the "Smoke Red" canister). Although physically similar to its standard counterpart, it is considered a separated weapon.

The BZ Gas is a knockout gas developed by the Humane Labs and Research, likely for military use.

Grand Theft Auto V
If the player randomly drops a BZ gas can (not into the air vent) while on the roof, it will simply behave like a regular Tear Gas. While statistically similar to its normal counterpart, the BZ Gas does not harm NPCs in any way, acting more as a distractive device rather than an actual weapon.

Grand Theft Auto V
The BZ Gas only appears if the player has chosen the smart approach for The Jewel Store Job. It first appears in the BZ Gas Grenades mission where Michael must steal them from a Humane Labs Boxville. Later, they appear in Franklin's inventory during the heist. The player must throw one in the vent in order to allow Michael and the heist crew to safely rob the Vangelico store. Like the Remote Sniper in GTA V and the Camera in GTA Vice City, this weapon is mission-exclusive and thus cannot be obtained or used out of the heist.

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