Forensic magnetometry is a crucial tool in archaeological surveys and crime scene investigations, relying on precise magnetic field measurements to detect buried metals or disturbances in the soil. However, outdoor seating—particularly metal benches, tables, or reinforced concrete structures—can significantly interfere with these readings.

Metal objects in outdoor furniture create localized magnetic anomalies, distorting the natural geomagnetic field and producing false positives or masking genuine signals. Even non-metallic seating with hidden structural supports can disrupt sensitive magnetometers. This interference complicates data interpretation, requiring investigators to either adjust equipment settings or exclude affected areas from analysis.

To mitigate these issues, forensic teams should survey seating areas separately or use ground-penetrating radar as a complementary method. Understanding these challenges ensures more accurate results in both archaeological digs and forensic investigations.