A grand jury in Union County, N. J., just indicted Dykstra on 3 serious crimes — possession of cocaine, possession of meth and making terroristic threats after an alleged blowup with his Uber driver last May.

Cops say they found evidence of cocaine and meth — and took Dykstra into custody. 

TMZ Sports obtained police body cam video from the arrest — in which Dykstra tells the cop he does NOT have a gun in his possession (as originally claimed by the Uber driver). 

Remember, the driver claimed Dykstra put a gun to his head during the incident. Dykstra says that’s just not true.

In the video, Dykstra is frantically trying to dissuade the cops from searching one of his bags — it seems obvious why: