“…For example, numerous studies have demonstrated that a significant proportion of offenders are able to suppress penile responses (Howes, 1998;Kalmus & Beech, 2005;Marshall & Fernandez, 2000). Furthermore, the interpretation of arousal is difficult, as some offenders may not be aroused to a certain stimulus, while others may be aroused to deviant stimuli but are not known to be sexual offenders (Bahroo, 2003). Therefore, the problems with low responding (O'Donohue & Letourneau, 1992), along with the lack of reliability (Barbaree, Baxter, & Marshall, 1989) and validity (Hall, Proctor, & Nelson, 1988), have led some researchers to question the utility of this procedure with sexual offenders (Marshall & Fernandez, 2000).…”