Ford S going in his house and taking Anna's effects, and changing the locks is the only thing that Stern did not plan for in this saga, they were obviously suspicious of Stern after 2 deaths and the refusal to give up the baby or the house.
It's cool.
Sometimes you gotta act like a crook to catch one! He has the bucks to fight any charges.
IF Ford Shelly threatened to kill someone over a business deal, do you think it is possible that there were other reasons why he went into that house?