Here is the law regarding purging voter rolls in MO
Posted on: October 18, 2016 at 13:18:10 CT
hefeweizen
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115.193. 1. Upon completion of a canvass as provided for in this chapter, a registered voter's name shall not be removed from the list of registered voters on the ground that the voter has changed residence unless:
(1) The voter confirms in writing that the voter has changed residence to a place outside the election authority's jurisdiction in which the voter is registered; or
(2) The voter fails to respond to a notice described in this section and has not voted in an election during the period beginning on the date of the notice and ending on the day after the date of the second general election that occurs after the date of the notice.