The idiots never got the memo where it is fine to take pics and video of state and federal buildings.
Just not the officers.
It was a knee jerk thing put in place back after 911.
Its fairly common to keep a skeleton staff, security mostly in these closed but not abandoned or sold facilities. Watching for thefts, break ins, and damage.
You will note the Lt had no gun, no arrest powers and had to call in the troopers to handle it for them.
Sorry if I offend anyone, but CO’s are the rejects from the LE barrel.