The "modified" form concludes the same as the FBI standard form, informing the individual that even if they talk without an attorney present, they "have the right to stop answering at any time."
The modification of procedure is necessary because, as the FBI manual states, "there is no way that a detainee in DOD or foreign custody will be allowed access to an American defense attorney""
The FBI is often contrasted with the military and the CIA in regards to its use of abusive procedures during interrogation. While eschewing "enhanced interrogation" techniques that amount to torture, such as waterboarding, close confinement, and stress positions, the FBI relies instead on psychological manipulations of "rapport" building procedures, while using the harsh pressure of isolation and sensory deprivation to break down the prisoner psychologically.
Isolation itself is a form of sensory deprivation, and is described as such in the KUBARK manual.
This form of psychological torture is added to standard police techniques, and in particular a form of interrogation procedure known as the Reid Technique. The FBI manual references several times the 1963 work on this technique, Criminal interrogation and confessions.
A 2009 study of this kind of interrogation technique in the journal Legal and Criminological Psychology found "innocent people are sometimes induced to confess to crimes they did not commit as a function of certain dispositional vulnerabilities or the use of overly persuasive interrogation tactics."
These are exactly the tactics the FBI uses, though they are then supercharged via use of isolation of a prisoner, which, as the FBI itself notes, "advantages" the interrogator by playing off the human need for "affiliation" or communication with others. Modern psychological and neuroscience investigators understand that this "need" is hard-wired in the brain, and deprivation of such social stimulation is a direct attack on the nervous system of the individual.
The failure to hold anyone accountable for the use of torture by U.S. officials, including accountability for those who planned and sanctioned such torture, meant that forms of torture were institutionalized in U.S. policy documents, such as the Army Field Manual.
The declassification of this FBI interrogation manual has allowed us to understand that such institutionalization has extended as well to the Department of Justice and the FBI.
[This article has been altered to reflect feedback from Col. Steven Kleinman received after the story was first published.]