When I run the the following command in a terminal I get different output. I try to find out if I am a member of the Wireshark group.
Does list wireshark
Does not list wireshark
So do I belong to the Wireshark group or not?
You haven't restarted per the instructions on that answer.
This isn't a case of "trusting" one over the other. They show pointedly different things.
Groups are applied to a user when they log in. That's why my instructions are to restart or log out then in again. This makes the system apply the new group and thus allows you to use Wireshark.
Try with your current username,
This is mine:
Check with any command for whether you belong to