Question about DarkRP categories and how to detect them [MOVING THREAD]

[Gordon Johnso]

This feels stupid, but I am wondering how to detect categories, like how you can detect player teams using ply: Team() == TEAM_NAME

If anyone could also provide some sort of example, I'm really struggling to find out a way to basically make it so that players set in a DarkRP category CANNOT be killed by a player in that same category, but can be killed by a player from a different category. Thank you all in advance, and I hope someone will be able to solve this issue/question.

EDIT: I accidentally posted this in the wrong area, so if any forum staff could remove the other one, or move it and delete this one. Thank you in advance, and sorry for making the same post, I just was trying to move the thread to the correct section.