FRANKFORT — Kentucky corrections officials say they failed to take DNA samples from between 6,300 and 7,000 felons as required by law over a four-year period.Justice Cabinet Secretary and Corrections Commissioner LaDonna Thompson said during a news conference Thursday in Frankfort that they are now trying to locate about 3,900 people no longer in state custody or on probation or parole to take samples from them.Gov. Steve Beshear appointed Transportation Cabinet Inspector General Cindy James to investigate why the DNA samples weren't taken.Under a law passed in 2009, anyone convicted of a felony on or after March 27, 2009 is required to give a DNA sample to be added to a state and national database.