so as not to leave a mark

Typical first time interrogation consisted of some kind of heavy metal music really loud, strobe light, lot of yelled questions and stuff like that, until they finally would break down and cry and say “I don’t know anything, I don’t know anything!” If [the detainee] was a particular target of interest that they thought knew something, you know, they’d grab him, punch him—stomach, neck, arms—you know, right in here [indicating the back of the arm, above the elbow], you’d punch them in the back of the elbows—hold your arms up—you’d punch them in the back of the elbow, I guess, so not to leave a mark. . .. Particularly people of interest, they really want to talk to, they would use everything.