Other objects that often leave impressions include the tips of crutches and clothing. The Alabama Department of Forensic Sciences Laboratory has analyzed evidence from all these objects and presented testimony in court regarding the analyst's findings. The steps involved in collecting and preserving this evidence begin with locating the evidence and using the proper equipment and materials. Sketching and photography are two useful techniques. Lifting or preserving the object on which two-dimensional impressions are located is also important. Three-dimensional impressions are best preserved by casting after they have been sketched and photographed. When properly preserved and presented to juries, this evidence has a strong influence on any trial.