“…For instance, although individuals in the legal system may have greater external pressure for change than those voluntarily entering treatment, this pressure may or may not translate to greater treatment gains (De Leon, 1996). The evidence surrounding the role of a more internalized motivation for change as a factor influencing the outcome of mandated treatments is also mixed, with some studies suggesting that stronger motivation to change leads to greater compliance and retention in treatment (Knight, Hiller, Broome, & Simpson, 2000;Sung, Belenko, Feng, & Tabachnick, 2004) whereas other research groups have found a null relationship (Kelly, Finney, & Moos, 2005;Nielsen, & Scarpitti, 2002;Hopwood, Baker, & Morey, 2008a, 2008b.…”