Recently, privacy advocates have become aware that US Customs and the TSA are demanding travelers turn over passwords to their social media and demanding travelers open up their laptops and mobile devices to gain your data. Leo says that is clearly a violation of privacy and the fifth amendment. That passwords and fingerprint ID should be protected. Leo recommends turning off all your devices while you're re-entering the country. But they may detain you until you do. So be ready to call a lawyer.