Voluntary posting on open web sites operated by author or author's institution for scholarly purposes.

A live showup (known as a street identification in the UK) allows the perpetrator to be identified shortly after a street crime. If the suspect disputes the identification, a video lineup often ensues. Four experiments examined the reliability of live showups and their influence on a subsequent video lineup using realistic procedures and conditions. Similar proportions of culprits and innocent suspects were identified from live showups and video lineups. Both culprits and innocent suspects previously identified were likely to be identified again in a subsequent lineup, with delays from a few minutes to a month. Only a weak effect of clothing bias was observed. There was strong evidence of commitment to a previous identification, but no reliable evidence of source monitoring errors. The results suggest that a live showup is not less fair than a lineup, but use of repeated identification procedures introduces an unfair bias against innocent suspects.Live showups and video lineups 4

White, 'How to cross-examine forensic scientists: A guide for lawyers' (2014) 39 Australian Bar Review 174. 2 Like HTCE, the discussion of methods (e.g. validation and error rates) in this article is primarily, though not exclusively, directed toward the comparison and pattern recognition domains. Though, the remaining discussion has more general application to the forensic sciences and medicine.

Using bis(amide) Zn(HMDS)2 (HMDS = 1,1,1,3,3,3-hexamethyldisilazide) as a precursor, this study explores the synthesis of N-heterocyclic carbene stabilized mixed amido-hydride zinc complexes using two alternative hydride sources, namely dimethylamine borane (DMAB) and phenylsilane PhSiH3. Hydride-rich zinc cluster Zn4(HMDS)2H6·2IPr () (IPr = 1,3-bis(2,6-di-isopropylphenyl)imidazol-2-ylidene), which can be envisaged as a co-complex of IPr·ZnH2 and (HMDS)ZnH, is obtained when DMAB is employed, with the concomitant formation of heteroleptic bis(amido)borane [HB(NMe2)(HMDS)] and H2 evolution. NMR studies in d8-THF show that although the bulky carbene IPr does not bind to the zinc bis(amide), its presence in the reaction media is required in order to stabilise . Reactions using the slightly less sterically demanding NHC IXy (IXy = 1,3-bis-(2,6-dimethylphenyl)imidazol-2-ylidene) led to the isolation and structural elucidation of the carbene adduct Zn(HMDS)2·IXy (). Contrastingly, mixtures of equimolar amounts of PhSiH3 and the zinc bis(amide) (60 °C, 3 h, hexane) afforded monomeric heteroleptic hydride (HMDS)ZnH·IPr (). NMR studies, including DOSY experiments, revealed that while the integrity of is retained in polar d8-THF solutions, in lower polarity C6D6 it displays a much more complex solution behaviour, being in equilibrium with the homoleptic species ZnH2·IPr, Zn(HMDS)2 and IPr.