Unless of course your name is Hillary Clinton, who wiped her server and beat 17 Blackberry phones to pulp when these devices were subpoenaed by the FBI.
This individual was not "detained" in the legal sense of the term. Have you never traveled internationally? All individual crossing a border -- either in the US or any other nation on Earth -- can be stopped and searched, and also questioned about their reasons for travel. The Supreme Court has held that such "routine" stops can last as long as 4-6 hours before a different legal standard need be applied.
Sigh, this has been explained in countless detail already. What was requested was the data on his phone, and that data was destroyed ... whatever it contained.
