 Before we describe such skepticisms in legal theory, we do well to be sure we have a firm grasp on what skepticism about causation is. Take David Hume, often listed as a skeptic about causation. Hume famously identified singular causal relations as spatiotemporally located instances of causal laws, and he identified causal laws as no more than uniformity in sequence between types of events. Hume was thus doubly a reductionist about the causal relation, reducing it ultimately to regular concurrence. In this, he is commonly said to be a skeptic.