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In 691, the official Liu Xinggan () was accused of treason. Wu Zetian had the chancellor Shi Wuzi investigate along with Lai. After Liu Xinggan and his brothers were executed for treason, Lai further reported to Wu Zetian that Shi had good relations with Liu Xinggan and had tried to hide evidence of Liu Xinggan's guilt. Wu Zetian had Lai investigate Shi as well and Shi, in fear, committed suicide.