The Cult of Rapture has a rundown on the Decoy Plasmid in BioShock 2, the underwater shooter sequel that's due to surface in stores tomorrow. The article explains the Decoy's basic function as well as the more tactical ways it can be used after upgrading, and also provides a rundown on situations where it can be put to use. 2K Games also has issued a new Advanced Decoy Plasmid Trailer for your viewing pleasure, this is embedded below.