()-A small team of researchers from the University of Illinois and Iowa State University has developed what they describe as a theoretical model for both interpreting and predicting blood-spatter that results from a gunshot wound. Credit: (c) Physical Review Fluids (2016). (b) Definition of the angle of drop impact α and directional (sideways) angle γ, which is equal to the angle between the vertical plane containing the drop trajectory and another vertical plane containing the bullet trajectory and the target. Drop size is assumed to be 3 mm, implying velocities in the 5.3–7.5 m/s range. Panel (a) is reproduced from teaching material graciously provided by H. (a) Reconstruction of the trajectories associated with four bloodstains using straight trajectories versus ballistic trajectories and the geometry (locations of the stains, of the victim, and the impact angles).