‘Truth is a thing of this world: it is produced only by virtue of multiple forms of constraint.  And it induces regular effects of power.  Each society has its regime of truth, its “general politics” of truth: that is, the types of discourse which it accepts and makes function as true; the mechanisms and instances which enable one to distinguish true and false statements, the means by which each is sanctioned; the techniques and procedures accorded value in the acquisition of truth; the status of those who are charged with saying what counts as true’ Michel Foucault
Not exactly a science, perhaps through my personal “battle for the truth” I am just waiting for Godot.