I Have Fibromyalgia, At Doc Office, They Use Dixie Cups

I have fibromyalgia,
At doc office, they use dixie cups that sit on shelf, for urine test, then pour into a specimum cup....can someone contaminate these dixie vups for a false positive for thc ...thetest done THC-Delta-9- COOH, result ;positive , conc: 12.1...
Im use fentynol patch 50, zoloft 200, premiarin .45, fexerill 5-10 not daily, diazipam 10 not daily, smoke little swisher cigars daily???