A few samples
> 95% [of polled Candians] know not to share their passwords
https://www.getcybersafe.gc.ca/cnt/rsrcs/vds/nln-sft-stck-p/...
> don’t share your PIN, password or personal security questions and answers with anyone, not even family members
https://www.canada.ca/en/financial-consumer-agency/services/...
> If you’ve shared passwords with friends, now would be a good time to change them
https://www.getcybersafe.gc.ca/cnt/blg/pst-20180913-en.aspx
> Protect your password, don’t write it down or share it with anyone and change it often
https://www.canada.ca/en/employment-social-development/progr...
A few days of every single traveler saying "no" would force them to either begin seizing all electronic devices or to drop the entire endeavor as untenable. This problem doesn't need a technical solution beyond making sure locked devices are actually secure.