The massive class-action lawsuit represents tens of millions of people, anyone who ever smoked cigarettes like Marlboro Lights or Camel Ultra Lights, since the products were put on the market more than 30 years ago.

NPR: Judge OKs Class-Action Suit by 'Light' Smokers

The markings show up under ultra violet lights and, unlike property marking pens, are nearly impossible to remove.

BBC: NEWS | UK | England | South Yorkshire | Security kits to cut burglaries

Otherwise several devices of a Heath Robinson nature are suggested boards to deflect the trajectory of urine and droppings, flashing lights, ultra-sound, unpleasant smells, stuffed owls, rustling aluminium foil and helium-filled balloons.

ECONOMIST: Bat raves

Now, these folks are hard at work on a new manufacturing process for ultra-efficient LED lights that will make them more affordable for people all across the country and around the world.

WHITEHOUSE: President Obama Holds a Town Hall in New Hampshire

Some feared that ultra-violet rays from the concert lights would affect the marble.

ECONOMIST: Rock the Taj