Thanks for your interest in our study. After you complete the brief questions below, we will get in touch with you if you are eligible.

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* Do you have an Android smartphone?
(an iPhone is not acceptable, nor a tablet of any kind)

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* Are you between the ages of 18-65?

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* Are you currently receiving professional treatment for substance abuse?
Professional treatment means a counselor, therapist, psychiatrist or other doctor who prescribes medication for substance abuse (e.g., suboxone, methadone, naltrexone). Alcoholics Anonymous and other 12-step self-help groups do not count as professional treatment for the purpose of this study. 

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* Are you Hispanic?

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* What is your race? Please check all that apply

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