“…also Meyer, 2022); they are based, among other things, on literature analyses ("top-down," see, e.g., VERA, Pressman, 2009), including "reviews of the available empirical studies and case experience" (see Meloy & Yakeley, 2014;for TRAP-18; also see Meloy et al, 2012;Meloy et al, 2015;Meloy & Gill, 2016), on expert consultation (e.g., VERA-2, see Pressman & Flockton, 2012, VERA-2R, see Pressman et al, 2018, Sadowski et al, 2017 and EvIs, see Ullrich et al, 2019), or "casework with UK convicted terrorists, cross-referenced to the literature where this provides corroboration, but essentially evidenced by the offenders themselves" (e.g., ERG22 + , s. Lloyd & Dean, 2015). However, due to low base rates ("rare events," which are scattered globally), all instruments lack broad empirical foundations; a true evaluation of the instruments is (still) largely absent-in fact it may be fundamentally unfeasable (see Scarcella et al, 2016; on the validation history and interrater reliability of TRAP-18, see RMA, 2019 andMeloy, 2020; on interrater reliability of ERG22 + , see Powis et al, 2019aPowis et al, , 2019b; on its construct validity, see Powis et al, 2019aPowis et al, , 2019b. Users should always keep this in the back of their minds.…”