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Introduction. Photography in forensic medicine can be used to document injuries as well as biological traces or some experimental casework. It can also be helpful to document traces invisible to the human eye. Therefor, infrared photography is an auxiliary tool. Initially hidden traces of blood on dark textiles become visible. It also serves for illustrating hematoma or gunshot residue on dark clothes. Progress in digital photography brings about easy handling and pictures with high resolution. In Germany, the pictures are accepted as evidence in criminal proceedings.
Learning objectives. When, why and how to use infrared photography? How to take pictures that are accepted as evidence at court?
Methods. Bloodstains and gunshot residue on dark textiles as well as hematoma were photographed with a modified and infrared-capable digital single lens reflex camera (DSLR camera). The pictures were taken in RAW and altered in Adobe Photoshop as to contrast and exposure.
Results. Due to strong absorption of infrared light, blood appeared dark. Dark surfaces, however, reflected infrared light and became bright. Also the human skin became pale. The resulting contrast between traces and surface allowed perform bloodstain pattern analysis or analysis of gunshot residue distribution. It also improved visibility of hematoma, especially when the hematoma is of minor age.
Conclusions. Modern infrared photography is a major tool in forensic casework. It is portable and usable in every crime scene. The results are helpful evidence in crime scene investigation as well as in clinical forensic medicine.