Human rights workers, activists, journalists and software developers are particularly keenly aware of the security of their laptops while traveling. Even in controlled environments, it’s impossible to give a laptop a clean bill of health with full confidence its always possible that it was tampered with in a way you did not think to check. The issue of tampering is particularly relevant for human rights workers and activists, all of whom hold sensitive data sought by powerful potential attackers. Hacking a target’s laptop by physically tampering with it probably happens only rarely because it’s expensive it may require travel and the risk of getting caught.”]
Source: https://theintercept.com/2018/04/28/computer-malware-tampering/