A new study by a team of researchers at the New York Times looks at the expanding use of life sentences in the American criminal justice system. The study, headed by Times reporter Adam Liptak, found that about 132,000 of the nation's prisoners, or almost 10%, are serving life sentences. Of those, 28% have life sentences with no chance of parole. This is a marked increase from a 1993 Times study that found 20% of all lifers had no chance of parole. Liptak also reported that about 9,700 people are serving life sentences for crimes they committed as juveniles.