 This directed graph suggests that the direction of influence—which could, but need not, be interpreted as causal influence—goes from hypothesis to evidence (though the probabilistic dependence goes both ways). The hypothesis node and the evidence node can be binary variables, such as “The defendant was the source of the crime scene traces” (hypothesis) and “The defendant genetically matches the crime traces” (evidence). But the variables need not be binary. The hypothesis node might take values from the range of 1–40, say the distance in meters from which the gun was shot, and the evidence node might be a continuous variable representing the density of gun shot residues (Taroni et al. 2014).