LOL, you don't need a coin-knife to smuggle a "weapon" past a metal detector. You only need a tool pouch and a butt-set.
Nobody ever checks the phone guy. If I was a thief I could have stolen tons of stuff because much of my work is in behind-the-scenes places in businesses - storerooms, private offices, tool rooms. People see you back there but take one look at your tools and go on about their business. Just today I was waved around a metal detector by a security guard in a court house - AFTER showing him my pocket knife and offering to go back outside and leave it in the truck. True, you need a cable knife and scissors to do the job, but for all he knew I also had a gun in the cable box. He didn't check ANYTHING.
I'm an honest guy and I'm glad they trust me but they shouldn't trust you JUST BECAUSE YOU HAVE A TOOL BAG!