Marijuana. It's not just for Justin Bieber anymore!
With Washington set to legalize the drug for recreational purposes, pot growers may soon be faced with the issue of what to do with the leftovers from their plants.
But Susannah Gross has an idea.
The owner of a five-acre farm north of Seattle, Gross has spent the last four months supplementing the food of four pigs with this substance - and the results have been impressive: