Accusation (), teaching their subordinates how to accuse people of crimes and how to create details that make the alleged plot appear logical and likely. Lai and the other secret police officials were also said to have created a number of torture methods and equipments to get the accused to confess, and further, each time he knew that a general pardon was set to be issued, he had the jailers kill important prisoners first before the general pardon would be declared. Lai's authorities continued to grow, particularly after Empress Dowager Wu herself took the throne in 690 as "emperor" of a new Zhou Dynasty, interrupting Tang and reducing Emperor Ruizong to the rank of crown prince. 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. That year, a famous incident involving Lai and fellow secret police official Zhou Xing occurred. Earlier that year, the general Qiu Shenji () had been accused of crime and executed, and subsequently, there were secret reports that Zhou was involved with Qiu's crimes. Wu Zetian had Lai investigate, without Zhou's knowledge. One day, Lai and Zhou sat down to lunch, and Lai asked Zhou the question of, "Many of the accused are not willing to confess. Do you have an idea on how to get them to confess?" Zhou responded, "That is easy. Take a big urn and set a fire under it. Put the accused in it, and surely he will confess everything." Lai had a big urn brought and a fire set underneath, in accordance with Zhou's instructions, and then rose and stated to Zhou, "I had received secret instructions from Her Imperial Majesty with regard to you, my brother. Please enter the urn." Zhou, in fear, knelt and confessed. Wu Zetian did not execute Zhou but exiled him, and on the way to his place of exile, Zhou was killed by his enemies. (This incident inspired the Chinese proverb "invite the gentleman into the urn" (請君入甕, qing jun ru weng), now used for the concept of putting a person into a