IANAL but mens rea is a serious consideration here. A prosecutor would have to prove that you have knowingly and wilfully committed the crime in order to be convicted, so unmarked cars are in practice out of scope. I think the main implication is that you won't be able to use any drone recordings for legal action against ICE unless you can prove that you recorded from further than 3,000 feet (one hell of a camera) or…
Why can't I just say "I didn't know I was speeding, prove I did it wilfully"