A 'rogue trader' at UBS has lost $2 billion. Police announced they've arrested a suspect. The bank was bailed out by the Swiss government in 2008 and has come under investigation for aiding US tax evaders. This is just the latest in a long history of rogue trading. Nick Leeson sunk the UK's Barings Bank in 1995. The banks are as much to blame. They haven't placed sufficient controls on their employees. Will they ever learn their lesson, or will they continue to get burned?