You've probably heard that medical marijuana can help with pain.

But look at what it's done to scientists trying to study medical marijuana.

Changing federal law to allow for the use of medical marijuana.

"This is really the central issue in medical marijuana," he said.

Although medical marijuana is available in many states, it remains illegal at the federal level.

The second wave concerned medical marijuana in the 1990s and 2000s.

"Since states are meant to be the social laboratories, we want to show how well medical marijuana can work."

The other laugh line is the fact that everyone calls it "medical marijuana."

Some countries such as Canada also permit the use of medical marijuana.

Article 4, Section 38, permits the use of medical marijuana.