How Is This Not Already A Law?

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Secretary of Transportation Ray LaHood went on television last night to announce his support for a law banning mass transit operators from sending text messages while on the job:

Despite recent collisions involving text messaging in Boston, San Antonio, and the tragic train crash in California last year, there has yet to be any national action taken to address this issue.
I for one have no idea how this isn’t currently illegal, but I’m glad the government may be finally looking into banning mass transit workers from texting at work.