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I bet you it's a space issue. You can't house women with men, it's a bad idea, and even though the number of female offenders are probably higher now than ever, they probably haven't increased the size of the jail. Where I live, there aren't enough facilities for females in the city jail. They sleep on palletts on the floor, that's how bad it is. The crowding has gotten so ridiculous, but they haven't done anything to fix it.
At least that's my opinion. It could be an unfairness in sentencing, but I'm guessing they keep most of the room for violent offenders, drug charges, things like that.
That's just my two cents.