The police handed over the house, she doesn't know police procedures, they were asked to clean it up. They as u med the police were thorough. It's not as if the buckets were hidden.
So what anyway? Is it really being suggested that blood on soaking clothes was somehow added to the silencer?
Is that the play here? 
It has been suggested several times, hasn´t it?
ANYWAY, and I am not saying that ANYBODY did ANYTHING to the silencer (apart from scraping off blood with a razor blade), the mere fact that the silencer was handled by people who stood to gain from a guilty verdict is problematic. That there were items from WHF in the house where the silencer was handled is additionally problematic.
I don´t think that silencer would be allowed into evidence in this day and age.