Everything I read in the PDF file references visitors, not employees. If they want to apply it to employees, they can do that as well.

this is under the "program objectives"


c. Prevent visitors entering Bureau grounds and facilities from
conducting prohibited activities or possessing prohibited

objects, by conducting authorized searches.


and this:

1. PURPOSE AND SCOPE.
This policy provides staff procedures and
guidance for searching inmate visitors, both social and legal,
official visitors, contractors, and volunteers, entering Bureau
of Prisons (Bureau) grounds and facilities, to maintain the
safety, security, and orderly operation of those facilities, and

protect the public.

--------------------------------


So you are saying this is applicable to you?

Prohibited Objects include, but are not limited to,
weapons; explosives; drugs; intoxicants; currency;
cameras of any type; recording equipment; telephones;
radios; pagers; electronic devices; and any other objects
that violate criminal laws or are prohibited by Federal
regulations or Bureau policies.
You cannot bring your phone to work, at all? can't have an MP3 player? Can't carry money for the lunch room?

In regards to the possessing vs carrying. The policies prohibit simply having a weapon in your vehicle. They can search your vehicles. Refusal to consent to a search requires that you leave the premises. If you are employed, you will most likely loose your job (it's been attempted once to my knowledge and I believe the employee regained their job after he brought sued the Bureau). See PS 5510.12 page 7 for the entirety of this quote:
that was my point. The law states you can carry a weapon, not store it. Leaving it in your car of in a lock-up is not carrying, it is storing or transporting. There is a difference .

it really doesn't make any difference though.

Since you want to apply this to you, here is the catch all phrase:


§ 511.12 Prohibited objects.
(a) “Prohibited objects,” as defined in 18 U.S.C. §
1791(d)(1), include any objects that could jeopardize the
Bureau’s ability to ensure the safety, security, and orderly

operation of Bureau facilities, and protect the public.


Having a weapon in your car does give them concern that somebody could break into your car and steal your weapon and then have said weapon on prison grounds. Prohibiting the weapons is within their powers.
So, either live with the rules or break the rules and fight it in court when you are terminated as well as possibly prosecuted.

As to the person you spoke about the sued and got their job back? I have my doubts. If they did get put back on the job, I would believe it was due to negotiations and not the outcome of any trial.