It was a documentary about the Green River Killer ...
... and the narrator has come to the mid-1980s, when it seems the killer was taking a break.
But no matter how much of a break the killer took, there is no way that you can state that "the number of bodies they had found dropped." Not unless some of them were mysteriously rising from the dead and returning to life, spending their remaining days among us like zombies.
(Yes, I think they meant "the rate at which they found bodies dropped", as in no longer a body every week. But honestly....!)
But no matter how much of a break the killer took, there is no way that you can state that "the number of bodies they had found dropped." Not unless some of them were mysteriously rising from the dead and returning to life, spending their remaining days among us like zombies.
(Yes, I think they meant "the rate at which they found bodies dropped", as in no longer a body every week. But honestly....!)