Commentary on: Gauriot R, Gunaratnam L, Moroni R, Reinikainen T, Corander R. Statistical Challenges in the Quantification of Gunshot Residue Evidence. J Forensic Sci 2013;58(5);1149–55. Issue 2 (March 2015) - Gallidabino, Matteo; Biedermann, Alex; Taroni, Franco