All major companies do. I was friends with one that worked at one of the largest major Canadian oil companies. Super nice guy, you'd never know it, then when discussion strayed towards work security topics, BAM, things got super dead serious. It got to be a joke, a challenge, he'd relax, then get serious, relax, serious, etc. "I know what you're doing," he finally says to me. "Keep it up, wise guy. I can do this all damn day."