This talk will explain disc detainer locks from their basic function to the highest security models. We will examine their emergence in various world markets, particularly their recent emergence in the North America. Schuyler will demonstrate known vulnerabilities from picking, to impressioning to low-cost key duplication. The goal of this talk is to introduce audience to this class of locks and provide them with a concrete base to consider the possible addition or exclusion of these locks to their own physical security solutions.