"A Dream Derailed? Investigating the Causal Effects of Student Protection Authorization Policies on Student Outcomes after College Closure" is the third and final of three reports from a collaborative research team of State Higher Education Executive Officers Association (SHEEO) and the National Student Clearinghouse Research Center, seeking to quantify the impacts of college closures on students' subsequent postsecondary enrollment and completion outcomes and to identify the policy levers states may have to support students who experience a closure. This report incorporates the state authorization policy context to ascertain if policy interventions can ameliorate the negative impacts of closures on students. It uses the treatment and control samples developed for the second report and adds a longitudinal dataset capturing state authorization policies related to student protections. [For the second report, "A Dream Derailed? Investigating the Causal Effects of College Closures on Student Outcomes," see ED629845.]