2004; Edenberg et al. 2004; Lappalainen et al. 2005; Pierucci-Lagha et al. 2005; Enoch et al. 2006; Fehr et al. 2006; Bauer et al. 2007) and impulsiveness (Villafuerte et al. 2012) while other authors have reported the major allele as the risk allele for AUD (Agrawal et al. 2006; Lind et al. 2008; Soyka et al. 2008), conduct disorder (Dick et al. 2006b), and externalizing disorder (Dick et al. 2009). The present evidence strongly suggests that the minor GABRA2 allele plays a role in behavioral disinhibition processes. This evidence concerns the gene GABRA2 and conduction system disorder.