The received view on the distribution of polarity items is that positive polarity items (PPIs) such as something are found in positive contexts; they are anti-licensed by negative contexts, which license negative polarity items (NPIs) such as anything. PPI some can however be found under the scope of clause-mate negation. Such a paradoxical use has been analyzed by Szabolcsi (2004) as a special case of licensing: two negative polarity licensors are required by the internal constitution of some. Some is however shown to occur under the scope of a single clause-mate negative. Single and dual negative environments are argued to depend on the same determinism. This determinism is shown to be activated propositions in the sense of Dryer (1996). Propositions accessible to the hearer characterize the contexts where some and other PPIs come under the scope of clause-mate negation in English and other languages, as demonstrated by the transferable diagnostics proposed. The reason for this correlation is that activation brings the whole proposition into the focus of negation, which does not interact directly with the PPI to produce infelicitous interpretations. A simple and general pragmatic determinism accounts for the marked character of the sequences, that allows a clear distinction to be maintained between licensed NPIs and anti-licensed PPIs.