Besides what has already been mentioned, maybe try drawing it from a worm's eye view, this will help with the big bad cop feeling. Also, the shades could use some work, how about making them more like old school aviators? That would give it a bit more on an authentic feeling (check out the ones they use in the movie Super Troopers).
Also, and I don't normally recommend this, but what if there were more simple elements like the badge to connect this pineapple with law enforcement stuff. I mean you could add a nightstick, big utility belt type deal, etc. and it could help it connect more. Try checking out some pictures of cops online for inspiration (be careful though, too many elements or being too detailed could ruin it!)
One last thing, the pineapple shape might be too geometric, maybe try roughing up the outside edge like a real pineapple?