Now that the FBI has opened a criminal investigation into the collision that brought down a Baltimore bridge, questions are being raised about the safety of giant cargo ships like the one involved.  

KCBS Radio's Eric Thomas spoke with a former Coast Guard officer who is now a maritime safety expert.

<p>Now that the FBI has opened a criminal investigation into the collision that brought down a Baltimore bridge, questions are being raised about the safety of giant cargo ships like the one involved.  </p>
<p>KCBS Radio's Eric Thomas spoke with a former Coast Guard officer who is now a maritime safety expert.</p>

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