” … But there is much money to be made by providing community corrections services, which are widely used across the criminal justice system as alternatives to incarceration and community supervision, such as probation, parole or home detention (“house arrest”). In 2014, an estimated 4.7 million people — more than double the prison population — were on some form of community supervision, many of them wearing GPS ankle monitors, living in a halfway house, or subject to alcohol and drug testing.”