I just finished Don Winslow's novel, The Powerof the Dog. Written in 2005 after six years of research, it cover the DEA Mexican drug wars from 1975 through 1999. A roman à clef, the tale reads true. Besides the DEA and the Mexican cartels, included are the CIA weapons for drugs program to support anti-communist efforts in Latin America, the roles of the Catholic Church (including Opus Dei) and even the American mob.
Much longer and much more detailed that the three other Winslow novels I have read (all dealing with the failed war on drugs). Nearly all the characters are deeply flawed, but there is a degree of redemption at the end. I highly recommend this book.