GP carries concealed, so by definition you wouldn't know. If you did know, then it's no longer concealed and that's a different issue.
But (depending on where you live) you'd also be surprised how many coworkers carry guns with them. At one company I was shocked. HR put a policy prohibiting concealed carry, and damn near 80% of my team took serious issue with it. It felt like I had accidentally walked into an NRA meeting or something. There were never any issues, and we tended to get into some heated arguments at that place. Turns out most gun carriers recognize and respect the gun and don't just pull it out and start shooting people every time they get offended.
But (depending on where you live) you'd also be surprised how many coworkers carry guns with them. At one company I was shocked. HR put a policy prohibiting concealed carry, and damn near 80% of my team took serious issue with it. It felt like I had accidentally walked into an NRA meeting or something. There were never any issues, and we tended to get into some heated arguments at that place. Turns out most gun carriers recognize and respect the gun and don't just pull it out and start shooting people every time they get offended.