“…However, some research suggests individual reports of substance use is reliable and accurate (Del Boca & Noll, 2000; Harrison, Martin, Enev, & Harrington, 2007; Rutherford, Cacciola, Alterman, McKay, & Cook, 2000; Van Den Berg et al, 2018). For example, in several studies comparing self-report and urinalysis, the concordance or agreement ranged from acceptable to high (Hjorthøj, Hjorthøj, & Nordentoft, 2012; Rowe, Vittinghoff, Colfax, Coffin, & Santos, 2018; Van Den Berg et al, 2018; Wilcox, Bogenschutz, Nakazawa, & Woody, 2013). In fact, in some of the studies, when there was a discrepancy between self-report and urinalysis, self-reported substance use was higher than what was detected with the biochemical measures (Denis et al, 2012; Hilario et al, 2015; Williams & Nowatzki, 2005).…”