We have tested a large group of sample replicas with standard investigation procedures.
In Fig. 2A, a first stage assessment of the quality of the replica is reported by mean of the alignment of a portion of the original bullet with the corresponding one on the replica using a standard ballistic microscope; in this way the samples have been also proven to be compatible with classical comparing procedures.
Moreover we would like to underline, how a better illumination is achieved on the planar replicas compared to the cylindrical metallic bullet (Fig. 2A left and right panel,
respectively).
Then two replicas of the same bullet have been compared in Fig. 2B, to show their reproducibility.
One can see that the size of the whole groove is the same and by increasing magnification into smaller details the micro-striae can be easily aligned, indicating that they have been produced by the same weapon.
This proves that our replicas satisfy the common requirements of microscopy alignment procedures, in the perspective of applying it to real investigations under the conditions
where for instance the evidence is held by a different laboratory that will send replicas to the requesting ones for analysis.
In such a way the original evidence will not be displaced thus preventing any troubles along the custody chain but the final user will be able to handle a perfect copy for any investigation.
The images reported in Fig. 2C and D, show a real analytical comparison of evidences where a bullet shot by a Beretta 98FS is compared with the replica of a different bullet shot by the same weapon (Fig. 2C) and the replicas of two different bullets shot by the same gun are compared (Fig. 2D).
We have tested a large group of sample replicas with standard investigation procedures. In Fig. 2A, a first stage assessment of the quality of the replica is reported by mean of the alignment of a portion of the original bullet with the corresponding one on the replica using a standard ballistic microscope; in this way the samples have been also proven to be compatible with classical comparing procedures. Moreover we would like to underline, how a better illumination is achieved on the planar replicas compared to the cylindrical metallic bullet (Fig. 2A left and right panel,respectively). Then two replicas of the same bullet have been compared in Fig. 2B, to show their reproducibility. One can see that the size of the whole groove is the same and by increasing magnification into smaller details the micro-striae can be easily aligned, indicating that they have been produced by the same weapon. This proves that our replicas satisfy the common requirements of microscopy alignment procedures, in the perspective of applying it to real investigations under the conditionswhere for instance the evidence is held by a different laboratory that will send replicas to the requesting ones for analysis. In such a way the original evidence will not be displaced thus preventing any troubles along the custody chain but the final user will be able to handle a perfect copy for any investigation. The images reported in Fig. 2C and D, show a real analytical comparison of evidences where a bullet shot by a Beretta 98FS is compared with the replica of a different bullet shot by the same weapon (Fig. 2C) and the replicas of two different bullets shot by the same gun are compared (Fig. 2D).
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