Rahul Gupta and his girlfriend, Taylor Gould, had been at Montgomery County Police headquarters for about five hours when their interrogators made a surprising strategic decision. They brought the couple together, and left them alone, to see if they would talk about which one had killed their friend Mark Waugh. For more, watch "What Happened in Apt. 1601?" Saturday, March 25 at 9 p.m. ET/PT on CBS.
