I once had my all my devices searched when returning to my home country (Australia). They kept my phone for a few days too. They didn't find anything and I wasn't charged wth any crime. But you only have to suffer this massive invasion of privacy once to make make sure it never happens again. Now when I return home I wipe all my devices in the time it takes to de-plane, collect bags and get to customs. Easy enough to get back up and running fairly quickly with an iCloud backup once I get home. Looks like I might have to do the same if I ever decide to visit the US again.