Enough monitoring to make them risky and inconvenient seems pretty achievable. Compel traveler to unlock all devices and hand over passwords. Clone the data. S

Enough monitoring to make them risky and inconvenient seems pretty achievable. Compel traveler to unlock all devices and hand over passwords. Clone the data. Scan for any references to addresses, sites or tools related to known cryptocurrencies. Foolproof? Certainly not. But how big a fraction of people would hide every trace of cryptocurrency management completely successfully and never slip up?