I am unable to answer your question in an explicit term. It is really case by case. For high level clearance, "no any problem in the past" is a good indication but it is not the only criterion. Your loyalty or family connection may also fall within the scope of issues that they need to justify. For example, the fact that one is the child of a high rank military officer in a foreign country may cast doubt for the authority to clear the person.最初由 Mat001 发布
Thanks a lot for your reply, 楚天. FYI, I became a Canadian earlier this year. Please advice me the possiblity of getting Secret level clearance. I don't have any problem with my past.
Nonetheless, if they have enough information (it may take quite some time as you have been resident in many nations) and are convinced that you would not reasonably be expected to cause serious injury (for Level II) to the national interest, you will be cleared.