Flutterby™! : Border laptop searches get shared

ACLU says that information from laptops searched by Customs and Border Patrol agents has been shared with outside agencies at least 300 times.

The last several times I've been out of the country I cleaned up my laptop and made sure that I could get the data I needed over an encrypted link. That was because I was headed to China controlled territories, and I had not idea of my rights or what to expect, but it turns out it's a good idea for when you're headed back into the country. Until this ridiculous policy is changed you'd definitely be a fool to carry any proprietary information for which you have liability should it be released on physical media, and it's probably a good idea to wipe any local keys and your ~/.ssh/known_hosts, carry hard copy of your server IDs to prevent Man-In-The-Middle attacks, and restore that information from a password protected link when you're clear of customs (either way).

Here's the ACLU's analysis data.