Pot is legal in Colorado, but the capitol city has outlawed pot bars like those in Amsterdam, leaving tourists who flock to Denver to get high with no legal place to do so. But that may change soon.
Regulators in the 23 states where medical or recreational marijuana is allowed are having a tough time making sure pot buyers don't ingest harmful pesticides.
Police arrested about 100 demonstrators in Manhattan after crowds tried to block a major tunnel, and pepper spray was deployed in Colorado. In Baltimore, the curfew was honored.