Final answer:
To detect trace evidence on a body, a cotton-tipped applicator, various staining and microscopic techniques, and immunofluorescent staining for specific diagnostics are used. These methods can reveal minute details crucial in forensic investigations.
Step-by-step explanation:
During the reexamination of a body for forensic purposes, various techniques can be utilized to detect trace evidence such as semen, saliva, foreign fibers or hairs, and light bruises. Simple tools like a cotton-tipped applicator can be used for sample collection. However, for a comprehensive analysis, specialized microscopic examination and staining techniques are often employed
For example, Darkfield or brightfield silver stain examination can reveal microbial agents in lesion tissue, and microscopic analysis of blood smears stained with Wright-Giemsa can help detect infections. A microscope can discern very fine details like gimlet-dust or anomalies in furniture jointings indicating disturbance, important in cases of crime scene investigation. To ensure a detailed and accurate assessment of samples, various tests including serological and molecular diagnostics like immunofluorescent staining for rabies antibodies may be conducted, depending on the nature of the evidence being sought.