1.   A murder weapon in that case was never recovered.

2.   A team of detectives is scouring the area for the murder weapon.

3.   After all, anybody who read the description of the murder weapon in the Saturday papers could have sent the knives.

4.   Have they found the murder weapon?

5.   I think this was the murder weapon.

6.   My only direct experience with murder weapons was Cluedo, but even I knew enough not to mess with it.

7.   Nico and Molto had been clever enough not to search for the murder weapon, too.

8.   Police are searching for the murder weapon.

9.   Police found a knife at the scene that is believed to be the murder weapon.