Individuals accepted into community-based outpatient treatment for substance use disorders (excluding those receiving opioid pharmacotherapy for opioid dependence) will be eligible to participate. This is a multi-site, controlled trial, using NIDA's Clinical Trials Network platform, at approximately 10 Community Treatment Programs, in which participants (N = approximately 500) will be randomized to receive 12 weeks of either: (1) Treatment-as-Usual (TAU), reflecting standard treatment at the collaborating treatment programs in which participants are enrolled, or (2) a modification of TAU which includes access to the TES. It is hypothesized that access to TES will improve substance use outcome and retention in outpatient treatment.