(1) Using an unconstitutional procedure to enact legislation;
(2) Conducting an illegal investigation or an unlawful search or seizure;
(3) Performing another otherwise valid legislative act without proper legislative authority;
(4) Filing a false or incomplete report, disclosure or claim regarding an otherwise valid legislative act; or
(5) Using legislative office for private gain in violation of the provisions of chapter six-b of this code that define and enforce governmental ethics.