Marijuana hits the US campaign

DENVER (AP):Republican vice-presidential nominee Paul Ryan says the federal government shouldn't interfere with states that have legalised medical marijuana.

The Wisconsin congressman said while he personally doesn't approve of medical marijuana laws that states should have the right to choose whether to legalise the drug for medical purposes.

The Obama administration at first signalled that it wouldn't interfere with state-sanctioned marijuana distribution.

But the Justice Department has since angered marijuana activists by shutting down dispensaries in California and Colorado.