Databases play an important part in Forensic Science. In terms of X-ray analysis (X-ray powder diffraction), databases include those used for the interpretation of analytical data, and those created from the results of interpretation. The former includes the ICDD Powder Diffraction File (Full file) and its Forensic Subtile. The latter consists of a variety of locally created databases on. for example, paint compositions and drug seizure compositions. These small databases arc useful in assessing the evidential value of analytical results. and if populated over a long enough period. can provide other types of information such as manufacturing and social trends.