Chassis cert question

I know my chassis cert guy fairly well. I asked him once, just out of my own curiosity, what he could or couldnt do about the welds. He read me word for word what his "duties" are. There was a simple list of like 3 things he was suppose to be looking for. An undercut weld was the most important, another I remember as being a ground down weld(another big no-no, and another reason a tacked together chassis should not recieve a sticker).