More doping in women's sports. US sprinter Chryste Gaines has tested positive for modafinil, the same stimulant that Kelli White was using.

Gaines and White share the same coach. To my mind, that Gaines also tested positive seems to undermine White's claim that she was legitimately using the substance for a sleep disorder.

As I explained last week, modafinil is not specifically banned, but the doping cops have determined that it is similar enough to specifically banned substances to come within the "related substances" clause.

White's agent says it's "ridiculous" that athletes can be punished for taking something that wasn't banned and that they didn't know was illegal. "Everybody is taking something to be alert and awake. . . . Some people drink five or six cups of coffee, others people take modafinil. They were all under the impression modafinil was okay."

This argument is plausible, if not fully persuasive.