Public Trust Applicant Denied Eligibility Due to Continued Intent to Smoke Weed

When I’ve run into this situation, it has been for subjects which have smoked marijuana regularly for years while working for a company for years without incident. All of the sudden the company gets a government contract which requires that the subject have a public trust background investigation and the subject doesn’t really understand what is changing or why they can’t continue to use pot. Most have been in the IT field and I assume they had no problem getting a new job with a company that does not have government contracts after their public trust was (presumably) denied because they said they planned to continue to use.