u/cheirodeflor

I failed a random drug test that was given to everyone, but I do not use any illegal substances. As soon as I received the results, I went to a laboratory to get both a urine test and a hair follicle test done to verify the results. Both tests came back negative.
The original positive test showed a very minimal amount around 20 ng while the cutoff was 15 ng. From what I understand, standard tests typically have a cutoff of around 50 ng or higher. What confuses me even more is that my hair follicle test came back negative, even though its cutoff is only 1 ng.
Has anyone else experienced something similar? Or has anyone failed one too?
Thank you for taking the time to read this