But when you know that the suspect adheres to a fixed schedule and spends a substantial amount of time away from his home and weapons then why not aprehend him then? Why on earth would you wait till he's at his home?
Very valid and reasonable question.
One reason that I can think of is that they are not just looking to apprehend the individual. They are looking for evidence as well. Sure, they can hook the guy up at work but they still need to search the house....and when they do they need to assume an armed individual is inside. Thugs with guns usually have friends with guns.