I will preface this with saying i dont think stuff like this should happen, however in the DoD we are advised to never take a personal laptops (or phones) to a foreign country, only take a secondary laptop and ensure the hard disk is encrypted. Also keep as little information on the drive as possible.

Furthermore if a laptop (or other electronic device) is purchased in a foreign country either dont bring it back or bring it back and shred it.

I know this sounds extreme and expensive, but with cloud storage and cheap laptop's i cant imagine anyone travling to a foreign country not being able to have a secondary "disposable" machine with cloud backups (could be a challenge in say china, but if you are doing buisness in a country like that (government monitored and access restricted) you should have company policies in place already).