(at around 5 mins) Hearing L's suggested plan of disinformation, Officer Aizawa declares that Kira will believe there are 1500 investigators when there are really only seven. There are really only six (known) -- L and the five remaining policemen. His statement fails to take into account the cop who dropped out, and no one yet knows of Pember's fiancé, Naomi Misora, looking into things. The other policemen fail to correct him, too. But if we count Watari, who has been present in every police meeting, there are indeed 7 men involved.