He claimed to have taken part in the operation that masterminded the abduction and murder of Mehdi Ben Barka, and was as such one of the last surviving possible witnesses in the Benbarka Affair.

Boukhari claimed in his confessions that Ben Barka's body was transported secretly to Morocco and his corpse was dissolved in a bath of acid.

Boukhari authored two books, one about the Ben Barka affair, entitled Le Secret and the other Raisons d'état (published in 2005), in which he recounts the operations of the DST from the 1960s to the 1980s during the repression of various dissident movements, mainly from the socialist left.

Because of his revelations, Boukhari had many problems with Morocco's justice system, including defamation lawsuits by former employees of the DST and the Moroccan Ministry of the Interior,[2] whom he mentioned by name in his book, as well as other common affairs such as dishonoured cheques, which were claimed to be used against him in order to sentence him in a non-political affair.

The Moroccan authorities refused to issue a passport for Boukhari, which he requested in 2001 in order to be able to testify in France before the judge investigating the Ben Barka disappearance.