**The use of Geo-location to trigger EMI, to remind user about their training, to reduce relapses.** Others have begun to use geolocation data to alert individuals with SUDs about potentially high-risk environments [44-46]. For example, some SMS text messaging interventions for AUD have focused on encouraging self-regulation and planning before drinking episodes [47,48]. For those who are enrolled in treatment, the messages can reinforce treatment concepts. For those who are not enrolled in treatment, messages may serve as a primary intervention (or at least a reminder of past concepts) to short-circuit alcohol use before it occurs. [[Reducing Drinking Among People Experiencing Homelessness Protocol for the Development and Testing of a Just-in-Time Adaptive Intervention]]