Female lawyer explains to a policeman that he is actually breaking the law!

I don't know the full context behind this call nor who she is (if anyone knows please tell me) but what she tells the Policeman 👮‍♂️ is very interesting.
The cop wants to fine a driver for 'driving uninsured'.
She asks him "what commerce was he committing". That throws him off.
The lawyer explains to a policeman that he is actually breaking the law!