-66 always to have the interview documented through means which preserve the most of it, preferably through video or audio recording. With the smartphone technology nowadays, this is easy to do. But many detainees feel uncomfortable, especially in the beginning of the interview, and do not agree to video or audio recording. Moreover, even if they do (sometimes as a courtesy to the interviewer), during the interview they would not share as much sensitive information as they would if the interview is not recorded. What remains for the interviewer in this case are written notes. Other detainees however would readily agree to being recorded, and some would even insist on this if they see such a possibility. The interviewer should therefore assess in what way he/she documents the interview depending on the context. Whatever the case, he/she should carefully explain to the respondent how the information will be stored and used. 3.3.5.2. Interviewing in practice Interviewing vulnerable respondents requires careful preparation, engagement and empathy, as well as consideration of the possible effects of the exercise in the course of the interview.97 With regards to the place, there is a bright-line rule – it should be conducted at the location in which the respondent feels most at ease. This is usually in his/her cell, the activities room, the kitchen - but, as a rule, never the office of the prison governor or other official settings. For preparation the interviewer should read background material about the specific conditions of the group of detainees to which the respondent belongs. It is important to consider possible barriers for interviewing in advance – barriers of the environment, physical and psychological barriers, as well as the sociocultural barriers. There should also be a careful preliminary assessment of possible risks. At the preparation/planning stage, it is necessary to consider issues related to the composition of the monitoring team, such as the number, gender and training of the interviewers, and arrangements for interpretation, if necessary. In the course of the interview, the interviewer should aim at establishing rapport with the detainee. This is his/her main tool and one that makes the 97. For a good account for interviewing victims of trafficking, which may be used for other vulnerable groups see: UNDOC, Anti-human trafficking manual for criminal justice practitioners, New York, UN, 2009, Module 8.