272 FORENSIC GEOLOGY Figure 13 Scanning electron microscope image showing sediment particles adhering to fibres in a pair of orange shorts that had been placed on the torso of a murdered child found in the River Thames Figure 14 Scanning electron microscope image of a pennate diatom found in the lung tissue of a suspected drowning victim significant contribution in recent years to a number of high-profile trials involving murder, terrorism, international drug smuggling, and people trafficking Other areas of frequent geological expert-witness testimony include various aspects of environmental forensics (e.g contamination studies), engineering-geology failures, and traceability studies relating to food-stuffs and raw materials