What's caused the huge rise in women in prison in Oregon?

In the last twenty years, the number of women in prison in Oregon has tripled, even while property and drug crimes - the major drivers of women's incarceration - have fallen. What's causing the problem? Over-zealous charging practices, mandatory minimum sentencing, and treating more crimes as felonies are major reasons for the rise. Oregon is spending millions of dollars annually to warehouse women that we could be investing in treatment and community programs.