In the Studio City level destroy the four control towers at the start of the level.(You have to do this to proceed anyway.) Now in the north west corner of the subway area, a laser fence should diactivate. Behind it is a switch that can be activated. Continue on with the level. Just past the giant mushroom area, you should encounter a large green mutant(your briefer will call it a bodygaurd.) Destroy the sign that reads "Mutant Soccer Champ" behind the bodygaurd. Backtrack to the mushroom area. As you enter, take a right turn onto a gray cliff. Proceed along this cliff. You should find a reloader with a shield symbol with a lightining bolt on it. This is the riot shield.
