the point Is they had Oswald as a suspect, from the very beginning, indicating to me that they [the dallas police} were in on the assassination plot.
The book depository supervisor did an informal head count of people who had access to all floors and LHO was missing. The supervisor told police. Also there was a witness who saw someone in the 6th floor window with a rifle and told the police nearby. They connected dots quickly. Doesn't make LHO guilty of anything but it does explain why he was a suspect early on. Background checks revealed he lived in the Soviet Union. This probably didn't help.
