Minnesota can be very harsh on chronic truants. When our Mom died in 1989, my, at the time, 13 year old sister, kept skipping school because she was afraid that if we left him alone, something would happen to him. They sent her to Lino Lakes Juvenile Detention Center for 2 mos. I'm betting that's where Sherri was placed also. Back in the 80s, security was pretty lax for juveniles that weren't charged with violent crimes. The truant kids were barely watched. It would have been very easy for Sherri to slip out after dark and have a friend pick her up.