To investigate the real-world effects of marijuana researchers need a product that looks and feels like the real thing. And they're increasingly frustrated with government weed that is something else entirely.

To investigate the real-world effects of marijuana researchers need a product that looks and feels like the real thing. And they're increasingly frustrated with government weed that is something else entirely.

Taboos about drugs are lying shattered across the U.S., like broken debris after a party. But even as some states have begun to decriminalize or legalize marijuana, there is an argument that is making some Americans hesitate.