Why not? Lots of them will come to you, so the difference is owning and supporting the shredding machines or dropping the papers in the chute and seeing confet

Why not? Lots of them will come to you, so the difference is owning and supporting the shredding machines or dropping the papers in the chute and seeing confetti spew out the other end, proof enough that it's doing what it's advertised. Some shredding companies have large incinerators too, another large, expensive piece of hardware that every single police department probably can't reasonably afford.