Hello, I find out some reasons for going under comprehensive security check
1. Nationality+Army
2. Nationality + studies in a military college
3. Nationality + software development or precise science related work / direct or indirect work for a state, state aligned, or de facto state controlled entity and/or in entity in a particular sector: e.g. central bank, city administration, any part of the administrative or government apparatus, certain private companies.
4. Anything related to security. Nationality + cyber security analysts.
5. Nationality + travel or work in the middle east/russia/China
6. Nationality + multiple residency
There could be other combinations
Also nationality + education in stem
Nationality + phd
