Lost55

I have recently signed up with TnPap after being referred due to a failed pre-employment drug screen. The failed test was a result of an isolated incident, ingesting party refreshments that I believed someone was joking contained about containing weed. I am not a regular user of illegal/legal substances. I am scheduled for a 2 hr interview with an evaluator on Mon. I am nervous because I don't want to say or do anything that would lead to recommendations for treatment programs or extended monitoring. I saw a psychiatrist 6+ yrs ago for emotional issues that I have since found very constructive, non therapy non-medicine related methods of overcoming and managing. I can't even remember what was said during the few sessions I attended. Question: Should I be this worried? Worried about the evaluator procuring past mental health records that I am unsure of any official diagnosis? I've never been referred for substance abuse treatment, ever. This is all very unnerving and upsetting. Any insight would be helpful.