One in every 31 adults, or 7.3 million Americans, is in prison, on parole or probation, at a cost to the states of $47 billion in 2008, according to a new study. Criminal correction spending is outpacing budget growth in education, transportation and public assistance, based on state and federal data. Only Medicaid spending grew faster than state corrections spending, which quadrupled in the past two decades, according to [a new report] by the Pew Center on the States, the first breakdown of spending in confinement and supervision in the past seven years. The increases in the number of people in some form of correctional control occurred as crime rates declined by about 25 percent in the past two decades. As states face huge budget shortfalls, prisons, which hold 1.5 million adults, are driving the spending increases. Pew researchers say that as states trim services like education and health care, prison budgets are growing. Those priorities are misguided, the study says. States are looking to make cuts that will have long-term harmful effects," said Sue Urahn, managing director of the Pew Center on the States. "Corrections is one area they can cut and still have good or better outcomes than what they are doing now." About $9 out of $10 spent on corrections goes to prison financing (that includes money spent to house 780,000 people in local jails). One in 11 African-Americans, or 9.2 percent, are under correctional control, compared with one in 27 Latinos (3.7 percent) and one in 45 whites (2.2 percent).