“…Still, it is stated in the Interrogation Manual the aim of the GIS is to build up so-called 'internal pressure', which is assumed to be 'the tension aroused in the mind of the suspect by the perceived incriminating power of the pieces of evidence at hand' (Hoekendijk & Van Beek, 2015, p. 4), and which is believed to be different from external pressure, described as 'everything that might be used to force the suspect to talk or confess' (Hoekendijk & Van Beek, 2015, p. 4). Nevertheless, 'internal pressure' is a form of pressure which aims to influence a suspect's statements, and it could thus be argued that there is actually little difference between internal and external pressure (Gudjonsson, 2003;Kortlever, 2011;Leo & Davis, 2010;Verhoeven & Stevens, 2012). Moreover, the Interrogation Manual mentions that it is allowed for police interrogators 'to incisively interrogate the suspect and thereby use a certain amount of pressure' (Van Amelsvoort et al, 2015, p. 340).…”