What does the presence of residue on a person's hands or face typically indicate?

The presence of residue on a person's hands or face typically indicates the residue of a substance. This can suggest a variety of scenarios, depending on the context in which the residue is found. For instance, the residue may be from substances such as drugs, dirt, or chemicals, indicating recent contact with those materials. In law enforcement and investigative situations, finding such residue can be pertinent in gathering evidence or determining whether a person has been involved in specific activities, such as drug use or handling hazardous materials.

In contrast, while normal hygiene could involve clean hands, it would not account for any residue present. Similarly, recent cooking might leave traces of food or ingredients but does not universally explain the presence of unusual residue. Outdoor activity might lead to dirt or natural residues but would lack the specificity associated with identifying particular substances. Thus, identifying residue on a person's hands or face serves as a key indicator for further investigation into the nature of the materials in question.