Today's headlines from science and tech.

Here are today's most interesting science, health, and tech news reports. For analysis and commentary from around the Web, check out the  hot topics page. For Human Nature's takes, visit the blog. To add your own take, open or join a discussion thread in the Fray—and please link to the original story so others can participate intelligently in the conversation.

July 1

Louisiana law authorizes judges to order chemical castration of sex offenders
(Michelle Millhollon, Baton Rouge Advocate)

Holland bans tobacco in cafes but allows marijuana
(AFP)

Gene linked to heavy smoking may help prevent cocaine addiction
(Nora Schultz, New Scientist)

Amputee sprinter gets extra time to qualify for Olympics
(Ken Borland, AP)

More on drug-testing cities through their sewage
(Marla Cone, Los Angeles Times)

Yemen's rebellion against child marriage
(Robert Worth, New York Times)

Live organ sellers busted in Singapore
(AFP)