The principle holds sway in most schools. How else could someone be suspended for biting a Pop Tart into the shape of a gun? Or balls be forbidden at recess, just in case that ball might hit someone? Or have a student’s entire day planned for them, because otherwise they might not be a successful adult?
In the process, we lose so many possibilities, from the simple joy of playing ball all the way to the life-saving power of modern technology. More than that, it robs us of our precious autonomy, of the right and the privilege and the chance to test our world, to see what works and what doesn’t, to make our own choices about what risks we deem acceptable. And if that doesn’t begin at an early age, people won’t have as much practice to use that freedom well.
No, we err on the side of freedom. You won’t find the precautionary principle in full strength here.