For the last two years I've carried a honeypot laptop with me every time I traveled. I checked it in my luggage, left it unattended in my hotel rooms. After each trip, I did forensic analysis on the laptop to detect if it had been tampered with.

I wrote about my experience and methodology here: https://theintercept.com/2018/04/28/computer-malware-tampering/

I hoped that, if an evil maid attacker tried tampering with my laptop, I would not only discover the attack, but learn how it works, and possible who was behind it. Unfortunately (fortunately?), I didn't discover any evil maids.