Walt & Jesse are forced to destroy their RV when a break in Hank Schrader's "Blue Sky" meth case leads him to Jesse. Given his conversation with Hank, it can be believed that Old Joe has a fairly extensive legal knowledge. Not only does he hold his ground against Hank, he also helps to delay his search by making him get a warrant. When Hank is led away by a phony phone call by Saul Goodman, Old Joe destroys the RV. ("")
Walt, Jesse, and Mike Ehrmantraut visited Old Joe to borrow a giant magnet from his junkyard to destroy Gustavo Fring's laptop inside the police evidence locker. He sells them the magnet, 42 car batteries and an old truck to transport the magnet. ("") Old Joe later admits that he didn't think the plan would actually work and was amazed when it did. ("")
While watching the news about the ongoing manhunt for Jesse Pinkman, Joe receives a call from an unknown person asking if he knows who this is. Joe recognizes that it's Jesse and comments that everyone knows who Jesse is now. Joe comes to Skinny Pete's house to dispose of Todd Alquist's El Camino, promising to do it for free and reminiscing on old times. However, the El Camino's Lo-Jack is activated and Joe takes off before the police can arrive and suggests that Jesse do the same. ("")
- Joe is well educated in law. He used his knowledge against Hank when defending Walter and Jesse ("").
- Another example of his knowledge of the law is the usage of a Clarence Darrow quote “True patriotism hates injustice in its own land more than anywhere else” in one of his commercials.
- He also appears to have a working knowledge of engineering, as he is able to set-up the large electromagnet that Walt, Jesse and Mike use to erase Gus' computer from outside the Albuquerque Police evidence room. ("").
- The commercial for his junkyard states that it is “Veteran-owned”, indicating that he may be a veteran.