I am on hiv tail therapy and i take a lot of pills and what not for me to live i have asthmna and i am an?

i am on hiv tail therapy and i take a lot of pills and what not for me to live i have asthma and i am an artist so to speak i use a cleaner caLL M.E.K. TO CLEAN my brushes and i take sudafed for my allergies i am be charged with under the influence of methamphetamine and i want to know if i don't take the chemical can my meds or my hobby cause this incidence of false positive for meth