Medical marijuana is booming in Colorado. In Denver alone, there are more dispensaries legally selling the drug than there are Starbucks. But as medical marijuana use expands, regulation has struggled to keep pace.

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In other news, a suicide bomber killed 22 people and injured 80 others at a police crime lab in Baghdad, and a separate suicide attack at an American base in Afghanistan wounded 14 people.

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The Mexican government claimed a major victory in the war against drug cartels: kingpin Arturo Beltran Leyva was killed Thursday in a shoot out with a Mexican navy unit. Global Post correspondent Ioan Grillo reports.

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With budget woes causing cuts to essential services across California, several communities in the state are weighing whether to raise additional revenue through tax hikes on medical marijuana. Spencer Michels reports.

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Just south of the U.S. in Mexico, a ruthless drug war is taking a heavy toll on residents' lives on both sides of the border. Essayist Richard Rodriguez reflects on the increasingly unmanageable conflict.

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NewsHour contributor Jeffrey Kaye reports from Los Angeles on California's conflict between state and federal legislation when it comes to regulating medical marijuana facilities.

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The Supreme Court ruled 6-3 Monday that federal authorities may prosecute patients whose doctors prescribe medical marijuana despite state laws that allow its use. Following a background report on the ruling, Gwen Ifill hosts a debate on the consequences of…

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