The show also received the Emmy Award for Outstanding Drama Series in 2000 , 2001 , 2002 , and 2003 , tying Hill Street Blues and L.A. Law for most won in this category . In addition , the series received the Emmy Award for Outstanding Drama Series in 2000 , 2001 , 2002 , and 2003 , tying Hill Street Blues and L.A. Law for most won in this category .