  The reconstruction of the area of origin of spatter patterns is usually a
fundamental step to the determination of the area of the crime scene where the
victim was wounded. In this field, for almost a decade, the italian Polizia di
Stato has employed AnTraGoS, a forensic software which implements a
probabilistic approach to identify the area where the horizontal projections of
the trajectories of a set of blood drops converge (area of convergence) and to
estimate the height of origin. In this paper we summarize a series of tests
performed on a published dataset of spatter patterns, whose results confirm the
validity of AnTraGoS and of its algorithms. As a side result, some useful
suggestions are derived, concerning the determination of the height of origin,
within a statistical and fluid dynamic approach.
