The problem is explosives are highly regulated, especially after the Oklahoma bombing.
ATFE will have a positive fit if you are manufacturing explosive devices.
Fact is most if not all states have laws about it also.

Get the proper license, and it’s not hard or overly expensive and it doesn’t matter.
Do it without the license and you are violating both state and federal laws.

Okay, straw purchases, purchases/possession by felons, manufacture of destructive devices, yup he’s not smart and has gotten himself and others over a barrel on this one.

Read the warrant and indictment for the information on this one.