Why is castor an Avox?

Why is castor an Avox? They are unable to speak and put to work as servants. It is later revealed in “Catching Fire” that District 12 peacekeeper and friend of Katniss, Darius, is turned into an Avox after losing his position.

They are unable to speak and put to work as servants. It is later revealed in “Catching Fire” that District 12 peacekeeper and friend of Katniss, Darius, is turned into an Avox after losing his position.
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