Kansas constitution
Article two: legislative
Section 22

For any speech, written document or debate in either house, the members shall not be questioned elsewhere. No member of the legislature shall be subject to arrest -- except for treason, felony or breach of the peace -- in going to, or returning from, the place of meeting, or during the continuance of the session; neither shall he be subject to the service of any civil process during the session, nor for fifteen days previous to its commencement.