 In order to compare two groups of veterans those who received Intensive Referral and those who received Standard Referral, a series of independent sample t-tests will be run to see whether these two groups significantly differ on measures of substance use, addiction severity, trauma symptoms, satisfaction with referral process, and family support. Next the investigators will use Pearson correlation coefficients to look for significant positive or negative effects of referral type i.e., intensive v. standard with the measures listed above. The next step of the process will be to run ordinary least squares OLS regression models given the continuous nature of our main outcome variable, substance use. The investigators will first run models to examine main effects. Next, the investigators will test for interaction effects to determine whether the effect of PTSD on substance use disorder varies by type of referral. Finally, ordinary least squares regression models will be run to determine whether 6-month abstinence rates are lower for those without family support compared to those with family support. 