While the school was in lockdown, people at many locations found it difficult to shelter in place, as few of the doors had locks for events of this nature. As a result, some students resorted to creative mechanisms to keep the doors closed. Scott Waugh, the school's executive vice-chancellor and provost, said the University will review its active-shooter protocols. The issue was previously brought up during deadly mass shootings at Virginia Tech and Sandy Hook Elementary School, where students and teachers also had to improvise to keep the doors to classrooms closed. Although some schools across the country installed locks to doors, a more widespread adoption of this security measure was hindered by "the cost to retrofit doors and local fire codes that require doors to open in one motion during emergencies", according to experts. Some schools and universities disagreed about the importance of door locks during active-shooter situations; the University of Colorado stated that it wanted students and teachers to rely on training instead.