Evidence

About every other day I go for a two mile run on the streets near my house. At the halfway mark I walk for about fifty yards to catch my breath before running home. The other day, during my walk, I noticed this spent shell casing on the pavement next to the curb. I thought about notifying the police, for gun fire is rare to non-existent in my neighborhood (to the best of my knowledge). But I let it be and did not inform any authorities. Two days later the casing was still there. I picked it up and took it home.