In the 1980s historian Robert Darnton affirmed some of these accounts. They accused Brissot of being a police spy, saying that he was plotting against the revolution he had once stood behind. Brissot was tried on many occasions to defend himself from these accusations. Darnton argues that Brissot on a personal level did not support the Revolution; for instance, he had gone to a police station to ask if he could be of assistance. When he was turned away, Darnton says, he gave the police information about the revolutionaries. Historian Frederick Luna has argued that the letters from which Darnton got his information were written fifteen years after the supposed incident. Luna argues that this event could not have occurred as reported; Brissot was documented as having left Paris as soon as he was released from the Bastille, and therefore could not have talked with the police as alleged.