I have found the DTW customs folks to be the most intrusive/suspicious/thorough.
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Western Airlines:
Be prepared for the Customs folks. My rollaboard was completely searched, and my backpack was given a cursory search in DTW Sunday. My digital camera photos were looked at for kiddie porn. Good thing I'm not into that. I got about 10 questions about my trip, possibly because it was short and I had no checked luggage.
Be a good boy and declare everything. I did and didn't have to pay duty, even though my declaration exceeded $400 AND I was only gone from the U.S. 45 hours, not the minimum 48. Honesty pays.</font>