In 2005, Christie prosecuted the Hemant Lakhani terrorism case, in which the defendant claimed that he had been entrapped. In that case, Christie's office relied on an informant who had been dismissed by the FBI as unreliable for fabricating claims of terrorist activity. For more than a year, the informant, working with the U.S. attorney's office, solicited Lakhani for access to arms. Lakhani was unable to obtain anything until an undercover agent contacted him and supplied him with a fake missile. In an interview with the public radio program "This American Life," Christie brushed off suggestions that Lakhani was entrapped by law enforcement, defending the Lakhani prosecution.
In April 2009, Christie came under fire from the ACLU for authorizing warrantless cellphone tracking of people in 79 instances. Christie has stressed that the practice was legal and court approved.