Pretty sure the taser in the door handle would be viewed as an illegal boobytrap if anyone (particularly a cop) ever got hit with it. And the oil injection smoke screen certainly violates pollution laws if nothing else. Nowadays, probably get you a trumped up "release of a chemical weapon" charge if the feds get involved...
Actually installed a couple systems like this many years ago. Oil injected into the exhaust manifold for smoke, propane injected near the tailpipe (with a spark igniter at the opening) for shooting flames.
More power to him for standing up against abusive cops (and there are LOTS of them around), but those 2 items actually give the cops a legally justifiable REASON to bust his balls. Part of me suspects that provocation might be just what this guy wants, though...