Are the corpse and the shotgun admissible at trial?Why or why not?

Driving problems

In the dark ages (before Peyton) my wife was driving to work one morning. She was stopped by a police officer on Route 128. When she asked why she was stopped, the officer informed her that her back license plate needed to be secured by three screws, but she only had two (there is no such law).

Okay, that part is true. Now suppose the following. When the officer approached the car, he couldn’t help but notice that there was a headless corpse on the backseat, along with an illegal sawed-off shotgun.

Are the corpse and the shotgun admissible at trial?Why or why not?