“…Early studies showed that APD was an indicator of poor treatment response, particularly in opioid-dependent samples (Alterman & Cacciola, 1991;Cacciola, Alterman, Rutherford, & Snider, 1995;Rounsaville, Dolinsky, Babor, & Meyer, 1987;Rounsaville, Kosten, Weissman, & Kleber, 1986;Woody et al, 1985). Later reports are mixed in their findings.…”