Can You Frisk a Hard Drive?

From TheLedger.com:

If you stand with the Customs and Border Protection officers who staff the passport booths at Dulles airport near the nation’s capital, their task seems daunting. As a huge crowd of weary travelers shuffle along in serpentine lines, inspectors make quick decisions by asking a few questions (often across language barriers) and watching computer displays that don’t go much beyond name, date of birth and codes for a previous customs problem or an outstanding arrest warrant.

The officers are supposed to pick out the possible smugglers, terrorists or child pornographers and send them to secondary screening.