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Excerpt from www.civilbeat.org
This may sound strange, but we still prosecute property as well as people. The rationale is even weirder and dates back centuries.
Suppose you were living in ninth-century Britain when something terrible happened. You were on your way to market to sell something when a brigand came out of the bushes, demanded your goods and then stabbed you with a dagger.
If he was caught, the highway robber would be prosecuted (or worse) and so would his dagger. In fact, the Crown would confiscate it.