Requesting officer information is a vital step in protecting your rights and promoting transparency in police interactions. This information can be useful in various ways, such as:

• Filing a complaint or reporting misconduct
• Seeking legal counsel or advice
• Requesting police reports or documentation
• Ensuring officer accountability and transparency

https://observed.org/getting-badge-numbers-and-officer-names/

you may be fine with some anonymous fascism but I want the badge # and name so when I sue, I know who the fuck to go after.

It's so a complaint can be filed against the officer.