Dozens of people marched Saturday through Puerto Rico's capital amid growing support for a recent bill filed by a former police chief that aims to legalize marijuana for personal use, unleashing an unprecedented debate in this conservative U.S. territory.

A Southeast Portland couple claims their neighbor’s legal marijuana grow is making them sick. But is it possible to be allergic to marijuana plants?

A federal appeals court Tuesday rejected a petition to reclassify marijuana from its current federal status as a dangerous drug with no accepted medical use.

Teenagers' perception of the dangers of marijuana has fallen to the lowest level in more than 20 years, a new study says, prompting federal researchers to warn that already high use of the drug could increase as more states move to legalize it.

Welcome to the confusing and often conflicting policy on pot in the U.S., where medical marijuana is legal in many states, but it is increasingly difficult to grow, distribute or sell it. And at the federal level, at least officially, it is still an...

Colorado gave a lonely reception to marijuana when it became the second state to legalize the drug. Just as state leaders planned.

In spite of our neighbors to the north beating us to the punch, many Eugene residents say that Oregon won't be far behind in passing measures to legalize gay marriage and marijuana.

The crowds of happy people lighting joints under Seattle's Space Needle early Thursday morning with nary a police officer in sight bespoke the new reality: Marijuana is legal under Washington state law.

Late next week you can legally possess small amounts of pot in the state of Washington. Voter-approved Initiative 502 goes into effect on Thursday.