A new study released Monday found that nearly half of all black males and almost 40 percent of white males are arrested by the time they are 23-years old. The analysis of national data from 1997 to 2008 of teenagers and young adults’ arrest histories — excluding traffic violations — were published Monday in the journal of Crime & Delinquency. While there was variation in the rate of arrest between black and white men, there was little racial variation in the arrest rates among women of different races.