They shoot horses, don't they?

Echoes of the depression in this story in the Irish Times today about the fate of Irish horses left behind after the boom: http://www.irishtimes.com/newspaper/features/2010/0928/1224279819356.html. It includes this nugget of information:

If a horse has a “clean passport” – meaning that it hasn’t received drugs in its lifetime which make it unfit for human consumption – it can go to a meat factory, where it will be humanely killed. Its meat will then go into the food chain destined for Europe.