> You can't just pull up a weapon from the suspect home and call it a "murder weapon"
Yes, you can, and without any reference to evidence establishing that it is the murder weapon beyond it being described as “what police say is the murder weapon”, you should absolutely consider the probability that that is exactly what the police are doing.
Yes, you can, and without any reference to evidence establishing that it is the murder weapon beyond it being described as “what police say is the murder weapon”, you should absolutely consider the probability that that is exactly what the police are doing.