Episode 4 of Detention By Design looks at the 1980 event that came to be known as the Mariel Boatlift and the turning point it marked for the U.S. immigration detention system. As 125,000 Cuban refugees landed in Florida, most spent only a day or two in a processing center - while Haitians were held for much longer. The lessons learned by the federal government during this often chaotic time would shape the years that followed.