Controlled research utilizing a basic all-metal detector in the search for buried firearms and miscellaneous weapons.

Incorporating geophysical technologies into forensic investigations has become a growing practice. Oftentimes, forensic professionals rely on basic metal detectors to assist their efforts during metallic weapons searches. This has created a need for controlled research in the area of weapons searches, specifically to formulate guidelines for geophysical methods that may be appropriate for locating weapons that have been discarded or buried by criminals attempting to conceal their involvement in a crime. Controlled research allows not only for testing of geophysical equipment, but also for updating search methodologies. This research project was designed to demonstrate the utility of an all-metal detector for locating a buried metallic weapon through detecting and identifying specific types of buried metal targets. Controlled testing of 32 buried targets which represented a variety of sizes and metallic compositions included 16 decommissioned street-level firearms, 6 pieces of assorted scrap metals, and 10 blunt or bladed weapons. While all forensic targets included in the project were detected with the basic all-metal detector, the size of the weapon and surface area were the two variables that affected maximum depth of detection, particularly with the firearm sample. For example, when using a High setting the largest firearms were detected at a maximum depth of 55 cm, but the majority of the remaining targets were only detected at a maximum depth of 40 cm or less. Overall, the all-metal detector proved to be a very good general purpose metal detector best suited for detecting metallic items at shallow depths.

[1]  John J Schultz,et al.  Detecting buried metallic weapons in a controlled setting using a conductivity meter. , 2011, Forensic science international.

[2]  John A. Dearing,et al.  Mapping soil magnetic properties in Bosnia and Herzegovina for landmine clearance operations , 2008 .

[3]  Tom J. Griffin,et al.  A Multidisciplinary Approach to the Detection of Clandestine Graves , 1992 .

[4]  Carl V. Nelson.  Metal Detection and Classifi cation Technologies , 2004 .

[5]  Edward W. Killam.  The Detection of Human Remains , 1990 .

[6]  Margaret Cox,et al.  Forensic Archaeology: Advances in Theory and Practice , 2005 .

[7]  Raymond C. Murray,et al.  Forensic Geology: Earth Sciences and Criminal Investigation , 1975 .

[8]  G. Clark Davenport,et al.  Remote sensing applications in forensic investigations , 2001 .

[9]  Ian Taylor,et al.  Law and Order , 1981 .

[10]  Joyce Baird,et al.  A Controlled Archaeological Test Site Facility in Illinois: Training and Research in Archaeogeophysics , 1999 .

[11]  Mark Skinner,et al.  Guidelines for international forensic bio-archaeology monitors of mass grave exhumations. , 2003, Forensic science international.

[12]  J. McKinley,et al.  Forensic Geoscience: applications of geology, geomorphology and geophysics to criminal investigations , 2005 .

[13]  R. M. Koerner,et al.  Use of a metal detector to detect buried drums in sandy soil , 1983 .

[14]  T. L. Lyon,et al.  The Nature and Properties of Soils , 1930 .

[15]  Douglas D. Scott,et al.  Metal detector use in archaeology: An introduction , 1998 .

[16]  M Skinner,et al.  Planning the archaeological recovery of evidence from recent mass graves. , 1987, Forensic science international.

[17]  Marcella H. Sorg,et al.  Forensic Taphonomy : The Postmortem Fate of Human Remains , 1996 .

[18]  Melissa A. Connor,et al.  Archaeological Perspectives on the Battle of the Little Bighorn , 1990 .

[19]  A. Sarris,et al.  Detection of exposed and subsurface archaeological remains using multi-sensor remote sensing , 2007 .

[20]  Alastair Ruffell,et al.  Suspect burial excavation procedure: a cautionary tale. , 2009, Forensic science international.

[21]  John J. Schultz,et al.  Forensic Recovery of Human Remains: Archaeological Approaches , 2005 .

[22]  Kenneth W. Goddard.  Crime Scene Investigation , 1977 .

[23]  M. Collins,et al.  Sequential Monitoring of Burials Containing Large Pig Cadavers Using Ground‐Penetrating Radar , 2006, Journal of forensic sciences.

[24]  John J. Schultz,et al.  Using Ground-Penetrating Radar to Locate Clandestine Graves of Homicide Victims , 2007 .

[25]  Mary Rezos.  Controlled Research Utilizing Geophysical Technologies In The Search For Buried Firearms And Miscellaneous Weapons , 2009 .

[26]  Claudio Bruschini,et al.  Ground penetrating radar and imaging metal detector for antipersonnel mine detection , 1998 .

[27]  Jack G. Swanburg,et al.  NecroSearch Revisited: Further Multidisciplinary Approaches to the Detection of Clandestine Graves , 1996 .

[28]  Robert M. Koerner,et al.  The identification and location of buried containers via non-destructive testing methods , 1982 .

[29]  W. E. Galloway,et al.  Reply to the comments of W. Helland-Hansen on "Towards the standardization of sequence stratigraphy" by Catuneanu et al. (Earth-Sciences Review 92(2009)1-33) , 2009 .