As a parent I can some what understand wanting to know what your kids are buying.
But I also remember buying a lot of things that my folks knew nothing about until they found it, or I cut my self with it or my personal favorite, blew my self up with it. And after one or all of those thing happened, they never took the item from me. It makes me wonder now if they just trusted me that much or was hopping that I would do myself in so they would not have to feed me any more.