The mass imprisonment philosophy that has packed prisons and sent corrections costs through the roof around the country has hit especially hard in California, which has the largest prison population, the highest recidivism rate and a prison budget raging out of control.

According to a new federally backed study conducted at the University of California, Irvine, the state’s corrections costs have grown by about 50 percent in less than a decade and now account for about 10 percent of state spending — nearly the same amount as higher education. The costs could rise substantially given that a federal lawsuit may require the state to spend $8 billion to bring the prison system’s woefully inadequate medical services up to constitutional standards.

The solution for California is to shrink its vastly overcrowded prison system. To do so, it would need to move away from mandatory sentencing laws that have proved to be disastrous across the country — locking up more people than protecting public safety requires.

In addition, the state also has perhaps the most counterproductive and ill-conceived parole system in the United States. More people are sent to prison in California by parole officers than by the courts. In addition, about 66 percent of California’s parolees land back in prison after three years, compared with about 40 percent nationally. Four in 10 are sent back for technical violations like missed appointments or failed drug tests.