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Evaluation of forensic soil traces from a crime scene: robbery of a safety deposit box in Brazil

Abstract Soil traces can be used as evidence in criminal investigations due their transferability, great variability and persistence. The soil samples originated from a crime scene that occurred in the Curitiba Metropolitan Region, Brazil. Physical, chemical and mineralogical analyses were carried out on the soil samples. All results were statistically analysed using multivariate analysis (PCA) to verify the relative positioning of soil traces which had been recovered from a stolen safety deposit box (SDB) from a vehicle suspected of being used in the SDB transportation, and from the site allegedly used in the opening of the SDB. The methods employed were effective in discriminating between the sampling sites. The soil from the site used in the opening of the SDB could be excluded as being the location where the soil transferred to the SDB had originated as it was different in many characteristics. Supplementary material: The organic matter content of the samples, and their gibbsite and kaolinite values obtained by thermogravimety analysis (S1), and X-ray diffraction patterns of the silt + clay fractions (S2) are available at https://doi.org/10.6084/m9.figshare.c.4561004