I'm retired now, but being retired I sometimes fond myself in knife restricted areas more than when I was working. Living in the Northern suburbs of Washington D.C. in Maryland, my better half and I find ourselves 'downtown' very often for day trips to the many museums and art galleries and restaurants of the city. Most of the federal buildings have a 2 1/2 inch blade limit, and the security checks.
Since my edc cutlery is pretty small anyways, I never have much problem with the security. A Victorinox classic is on my keys, and a Case peanut is my pocket knife. I've only been held up twice going through some entrance way check point, and that was because the Case was being admired. One young lady in uniform had reached into the plastic tray and picked up my yellow handle Case, and was staring at it. I asked her if there was a problem, and she just said that her grandpa had carried a yellow handle little knife like that. She just handed it to me with a smile, and said I reminded her of him. Great, just what I wanted to hear form an attractive young lady, that I remind her of her grandpa! Another delay was a young man looking at my Case Thomas damascus peanut, and asking just what kind of steel that blade was?
Some buildings have more security than others, and it changes. Lke when the National Gallery Of Art gets a visiting exhibit from one of the big European museums, things can be tighter. You'll have mixed teams of securitypersonel from over there and here. The European security people, especially from the British Museum, seem much more anti knife, so if we're going in there, I just leave my edc pocket knife in the car and just carry the Vic classic. That doesn't make even the British guys blink.
Carl.