Maybe teach your child to come to you when presented with things that are questionable. If you are having daily conversations with your child, frequent conversations with their teachers, keeping in touch with your child's classmate's parents, etc, and staying active with attending school board meetings, it can be fairly easy to know what your child is being taught and what else is going on in the school without bowing to 24/7 big brother being introduced into your child's life as the norm.