They can obviously be as suspicious as they like to but they can be like that anyway. If they choose to believe you have two Facebook accounts, one to show to a

They can obviously be as suspicious as they like to but they can be like that anyway. If they choose to believe you have two Facebook accounts, one to show to authorities and the other to plan terrorist attacks with, then how can you prove them wrong. Don't carry any passwords with you so you can not login any service or device even if you wanted to. Leave them at home. A good reason to wipe your stuff prior your journey would be to minimise trouble if your equipment got stolen or lost (a plausible threat when travelling). I would tend to think there's nothing you can do to prevent them getting suspicious if they choose to do so. It's a bit unfair because it's a situation where you can't count on anything even if you have nothing to hide but that's, to my knowledge, just how it is.