The person who handled the fake health certificate was arrested. What if the police call me?

If the police call you, you need to cooperate with the police investigation. You can provide your own identity information to the police and answer their questions truthfully.

If you haven't committed a crime, then you don't have to worry, just cooperate with the police investigation. If you commit a crime, you need to bear legal responsibility.

In short, if you haven't committed a crime, then you don't have to worry, just cooperate with the police investigation. If you commit a crime, you need to bear legal responsibility.