Actually how is the legal situation on this? If they go all bomb scare crazy over this is it my fault as the sender even so it is not even remotely reassembling

Actually how is the legal situation on this? If they go all bomb scare crazy over this is it my fault as the sender even so it is not even remotely reassembling a bomb layout? Is there a ban on mailing home made electronics? Or do I need to put a sticker on ATTENTION, THIS IS NOT, I REPEAT, NOT A BOMB!