Many companies supply them. I was so scared that I wrapped my leg around my teacher as he assisted me. I learned my blood type. And I learned a lesson. He was one of the most outstanding teachers that I had ever encountered.
Most educators are there because of their willingness and eagerness to teach.
That is who they are. Please allow the teachers to do their job. If parents would do their job, teachers would have it so much easier. Biology is a science. Home economics is not.