Don't cops have to announce an arrest before demanding submission? This cop did not announce arrest.
I remember old tv shows: "Stop in the name of the law!"
Nope.
The taser, mace, or gun is prolly the first clue you’re going to get after “Put your hands on the hood and lean forward.”
But it would sound hella-cool with an English accent:
“Sir, I am now informing you that I am enforcing an arrest on your person. Please decist and assume a submissive profile.”
No. In fact it is often best to try to get the handcuffs on before they tell somebody they're under arrest. That's when some people really lose it and get dangerous.
To the extent that wasn't just movies and TV, I think "Stop in the name of the law" goes back several centuries to the notion of "hue and cry." By loudly calling out for the wanted man to stop in the name of the law, the un-uniformed, badgeless, officer was informing everyone that he was an officer of the law, and he was attempting to catch a suspected criminal. Every able bodied man had a duty to drop what he was doing, join in the "hue and cry" and help the officer pursue and catch the suspect.
Nowdays, with a uniformed and badged cop in a marked patrol vehicle, his stauts is clear, and anyone rushing up to "help" is liable to be arrested for interefring with the duties of a peace officer, if not just shot on the spot, so yelling "Stop in the name of the law" is passe.
That being said, I have to recycle the old joke about he difference between American cops and English cops.
American cops yell: Stop!, or I'll shoot!
English cops yell: Stop!, or I'll yell Stop! again.