| A | B |
| class characteristics | properties of evidence that can be associated only with a group and never with a single source |
| comparison | process of ascertaining whether two or more objects have a common origin |
| identification | process of determining a substance's physical or chemical identity |
| individual characteristics | properties of evidence that can be attributed to a common source with an extremely high degree of certainty |
| product rule | multiplying together the frequencies of independently occurring event to obtain an overall frequency of occurrence |
| reconstruction | method used to support a likely sequence of events by observing and evaluating physical evidence and statements made by those involved with the incident |
| IAFIS | Integrated Automated Fingerprint Identification System - fingerprints and criminal histories of 50 million individuals |
| CODIS | Combined DNA Index System – FBI maintained DNA index system |
| Forensic DNA Index | 110,000 profiles of unknowns from unsolved crimes |
| Offender DNA Index | 3 million profiles of convicted/arrested individuals |
| NIBIN | National Integrated Ballistics Information Network Bureau of Alcohol Tobacco Firearms and Explosives maintains ballistic images stored and correlated submitted by local jurisdictions |
| PDQ | RCMP maintains chemical and color information on original automotive paints |
| SICAR | Shoeprint Image Capture and Retrieval- commercially maintained database for shoe sole patterns (8,000) form 300 shoe manufacturers |