[kingu]

Wish there were more details about the size of the size and where it was placed, as the story reads like a single source version.

[WayneS]

What difference would the size of the sign make?

[Evil Slayer]

If it was a bumper or window sticker type sign, the officer just destroyed it by removing it. You can not get a sign like that to go back on and stay on after it has been exposed to air or crumpled by the officer. That, alone, would further grounds for a damage of personal properity without due cause.