Wipe those shoes

From my email:

Police Officer reports on his two-way radio: 

- We came to the crime scene : woman killed a man with ten stab wounds, the head is cut off, all his bones are broken, and she scalped him ... 

- Well, that's brutal... And do you know the motive ? 

- Apparently the man walked into the living room and set his foot on the floor when she just finished washing it ... 

- That's crazy ... did you already arrest the wife ? 

- No not just yet ... We are waiting until the floor gets completely dry ...