I think it is important to note that, though the product may only become dangerous if not used properly, there is lead used in the manufacturing of the product. After doing my own research, I found that in an article from Time Magazine Stanley told NBC, "they do use a lead pellet in the manufacturing process, in order to help insulate drinks from outside temperatures, it is covered by stainless steel and would not be able to contaminate drinks unless the stainless steel barrier was removed." While they claimed that it is rare for that to happen, it is possible.