The Art Loss Register is the largest privately operated database of stolen art, antiques and antiquities in the world. In operation since 1991 the ALR has become a standard part of due diligence in the process of acquisitions. This presentation will provide a detailed description of the ALR and how it is used by those trading in antiquities. Using case studies, the presentation will address both the strengths and weaknesses of the system and how this impacts the role of the conservator. This unique tool must be fully understood by conservators in order for its potential to be realized.