Did EP not know how to obtain a silencer?
But it had to be a believable story, Adam. So the police needed to have a second silencer found after they had vacated WHF and before JB went back inside after the murders, hence the relatives were the perfect choice , and naturally they would agree to the scheme because they were sure JB was guilty anyway.
I mean, obviously the police couldn't just say they searched the house again after questioning JB in sept and lo and behold found another silencer with Sheilas blood inside it, could they?