From the article:
:A search of Shrout's home found several small tobacco cans and two large cans, all with holes drilled in them and containing pellets, according to authorities. Taylor said all they needed were black powder and fuses to become explosives. The journal also allegedly mentioned using firearms. The sheriff said Shrout's father owned a few household weapons, such as a hunting rifle, a shotgun and a handgun:"
So the kid is a few fries short of a happy meal, I get that. But is a can of "pellets" illegal? By the same logic a can of black powder only needs a fuse to become a bomb, and I just need a sex change and a smoking hot body to become a victoria secret model.