I read the following from the guy who developed teflon coated bullets:
He thought the cops should have rounds that could pierce through car doors easily and drive straight through windshields without glancing off the slope.
So he developed a projectile milled from a solid block of brass. The teflon was for the windshields, not because of its slickness but because it helps the bullet "grab" the window, and not glance off if it hits obliquely. Maybe it helped protect the barrel, too.
Anyway, the media got a hold of the story and did one of their patented hysterias we've seen so many times (Glock-plastic pistols for terrorists, Black Talon bullets designed to harm surgeons who try to remove it, etc.) except their spin was that these were super cop-killer bullets whose teflon coating rendered body armor useless. I think Congress banned all armor-piercing bullets for pistols around then.
But the problem was, these were specialty rounds that were never going to go into the mass civilian market, they were made for the police. And not to penetrate body armor (although they certainly could) but to reliably punch through car doors and windshields. The final kicker is that the teflon coated bullets were actually LESS effective against kevlar vests than uncoated, solid brass bullets. Again, the role of the teflon was to help the bullet grip a windshield, not penetrate kevlar.
All of this comes as no surprise considering the media's love of feeding the public scare stories. CBS just had one last night on the sinister threat potato cannons pose to America's children [rolleyes]