The DPD didn't even know that Oswald had secured a job at the DPD.
Because they said so? They obviously knew all about the SN and they knew way too much about Oswald. Yet they were bumbling incompetent boobs when it came to handling evidence and managing a crime scene. I guess the gravity of the crime got them all flustered. So flustered that Fritz took no notes and handled evidence with his bare hands and staged evidence, etc.
The FBI said they couldn't have stopped Oswald even they had wanted to; they would be unlikely to obtain a warrant to have Oswald somehow 'watched' on that particular day. On what basis, anyway? He wasn't even on the list of persons considered a threat to the president during the Texas visit.
You don't expect the CIA to recruit a patsy that was on anyone's radar, do you? Give them some credit. You gotta start thinking more like a conspirator. Only then will you see the light.
Here is your list of patsy LNers:
Thomas Arthur Vallee - Plan A in Chicago (aborted)
Lee Harvey Oswald - Plan B in Dallas (succeeded)
Does anyone actually believe these 2 gentlemen just happened to occupy buildings directly adjacent to the Presidential motorcade route? Oswald got his job at the TSBD only 3 weeks before he supposedly shot and killed JFK. Imagine that.