A 37-year-old Milwaukee Public Schools substitute teacher is facing prostitution charges in Racine County.  Samantha Nelson allegedly used the website Backpage to advertise her services and was given 200-dollars for sex by an undercover detective when she was arrested.  Nelson’s husband was found by police behind the wheel of the van that took her to the meeting, and their children were also in the vehicle.  MPS has not commented other than to confirm she was not a full-time teacher in the district.