I've looked it up and it's due to 2 possible reason.
First off, as already mentioned, the officer may want to conceal his arrival.
Second off, and I've seen this particular reason happen to fire trucks and paramedics, they often activate their siren through red light and turn it off again simply because there's no traffic once they pass the red light. They leave it on when they're going through heavy traffic to get the people out of the way, when there's barely any motorist on the road, they have no reason to activate their siren.
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Looking out the window, that's an act of war. Staring at my shoes, that's an act of war. Committing an act of war? Oh you better believe that's an act of war
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