Drusus then settled an incident involving the abuse of the protection afforded by icons of the princeps, in which the emperor's images were being used to shield the guilty. Gaius Cestius Gallus brought a complaint into the Senate, and claimed he was being abused under this safeguard by Annia Rufilla. Drusus was soon brought in to weigh on the matter, for the Senate felt only a member of the imperial family could speak on such a delicate matter. At the request of many senators, Drusus had Rufilla arrested and imprisoned.  Later, he was given credit for the condemnation of two Roman equites , Considius Aequus and Coelius Cursor, who had attacked the praetor, Magius Caecilianus, with false charges of maiestas . It is unlikely that he himself was responsible, for every verdict was given by the Senate with Tiberius' authority, but this did not prevent his popularity.  
When Cicero, who was consul that year, exposed Catiline 's conspiracy to seize control of the republic, Catulus and others accused Caesar of involvement in the plot.  Caesar, who had been elected praetor for the following year, took part in the debate in the Senate on how to deal with the conspirators. During the debate, Caesar was passed a note. Marcus Porcius Cato , who would become his most implacable political opponent, accused him of corresponding with the conspirators, and demanded that the message be read aloud. Caesar passed him the note, which, embarrassingly, turned out to be a love letter from Cato's half-sister Servilia .