they didn't ban it but it can cause "Listeria monocytogenes" - a nasty form of food poisoning. It the same bacteria thats in Feta, and Camembert Cheese, hot dogs, luncheon meats, pates and meat spreads.
BTW I sit next to a girl who my wife has come to know as "my nutrionist". She's almost had heart failure because I've had a Viscount this morning, a Twirl with my lunch, and still have a packet of Salt 'n' Vinegar Square crisps for this afternoon. No credit either for having a Banana when I came in this morning.