If you're a firefighter or most kinds of laborers that bring tools to work, you're usually dealing with equipment and/or chemicals that are not safe or even permitted on the NYC subway.
https://nypost.com/2022/06/07/off-duty-firefighter-saves-chi...
https://www.reddit.com/r/Firefighting/comments/w008we/do_you...
Firefighter gear is covered in PFAS and is highly carcinogenic. I don't want them bringing that shit on the subway, no way.
I'm sure they keep it in the trunk of their car or in their garage, etc.