A once-standout U.S. narcotics agent who used his badge to build a lavish lifestyle of expensive cars, parties on yachts and Tiffany jewels was sentenced to more than 12 years in federal prison Thursday for conspiring to launder money with a Colombian cartel. But even as José Irizarry admitted to his crimes, he blamed former colleagues at the U.S. Drug Enforcement Administration for fostering a culture of corruption that desensitized him to the implications of violating the law.