School Allegedly Used Webcams to Spy on Students - Is this Unethical?

A school district in Pennsylvania is in a bit of trouble after allegedly using webcams on school laptops to monitor their students in and outside of school using spy software. The students and parents were uninformed about the use of this software and discovered it only after one student was called to his principal's office for bad behavior in his home. The principal then used a picture taken with the spy software to prove his case.