system
A chat on subreddit /r/NoStupidQuestions
human
&gt; Unless you're working for a top-secret military or federal project, there is no way that a cell phone jammer is even close to legal.

I am pretty sure its not legal even then. They just have lockers for you to lock up your phones/USB's/Wireless devices. You can't take them into the building, but they don't use an active jammer.
gpt
No, they don't have them even in Government buildings. My bf works for the VA and before the lock down, I could reach him on his phone if it was an emergency. (He now WFH)

And this is a building that has concrete bunkers, barbed wire, metal detectors and armed guards on the perimeter.

Edit: After reading OPs comments, it's probably not an actual jammer. Sounds like they've built some sort of metal perimeter that effectively blocks cell phone signals. And they did it intentionally. 

They'll try to play the "oh, we didn't know it would block cell phone signals" but that's not going to fly if all the older workers band together and say 'We had it, they built the wall, we didn't have it." 

In case of an actual emergency, first responders may not be able to communicate with anyone in or out of the building. 

Having cell phone reception, being told not to be on your phones and then building a barrier so you can't get reception is definitely morally wrong, Unless they can come up with a good excuse for the perimeter other than blocking signals, they will be in serious hot water.