“…Some studies find that young children who have been exposed to opioids and multiple substances have greater impairments in general cognitive abilities than non-exposed children (Bunikowski et al, 1998;Hunt et al, 2008;Johnson, Diano, & Rosen, 1984;Logan et al, 2013;Moe, 2002a;Moe & Slinning, 2001;Salo et al, 2009;van Baar & de Graaff, 1994;Wahlsten & Sarman, 2013;Wilson, 1989;Wilson, McCreary, Kean, & Baxter, 1979), whereas others do not find such differences either before (de Cubas & Field, 1993;Kaltenbach & Finnegan, 1989;Melinder et al, 2013;Rosen & Johnson, 1985;Strauss, Lessen-Firestone, Chavez, & Stryker, 1979) or after controlling for covariates (Bauman & Levine, 1986;Lifschitz, Wilson, Smith, & Desmond, 1985;Messinger et al, 2004).…”