It's always been a confusing aspect of airline and airport security: When you're going through TSA checkpoints, what actually is considered a "bad liquid?" CBS News travel editor Peter Greenberg reports.

(Photo by Lindsey Nicholson/UCG/Universal Images Group via Getty Images)

<p>It's always been a confusing aspect of airline and airport security: When you're going through TSA checkpoints, what actually is considered a "bad liquid?" CBS News travel editor Peter Greenberg reports.</p>
<p>(Photo by Lindsey Nicholson/UCG/Universal Images Group via Getty Images)</p>

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