That was his attempt at an April Fool's Joke. He twittered that he wouldn't be going to Detroit because of a random drug test administered during the week. Here's the link to the full story: http://thearenablog.net/2009/04/01/hasheem-thabeet-plays-the-april-fool-of-march-madness/

The writer of the blog makes a good point about how with the current controversies at the school how this is an absolutely terrible time to making a joke like that.