[ehs284]

"A specialist advised me to do it,"
  claims Michel Rouyer, a duck farmer in Gripperie-Saint-Symphorien,
  France. He was hauled into court after a search of his property found
  11 pounds of processed marijuana and a dozen plants, and he said it was
  for medicinal purposes -- for his ducks. "There's no better worming
  substance for them," Rouyer told the court -- and admitted he had
  smoked some too. "This is for real," said his lawyer, Jean Piot. "Not
  one [duck] has worms and they're all in excellent health."

Not cost effective - he was fined 500 euros 

[pigeonpie]

I read this the other day and did have a bit of a chuckle.  I can imagine the ducks couldn't care less if they had worms or not but I bet they had the munchies!!!
 

[Lindeggs]

And I bet his duck-liver pate was in 'high' demand for parties.