How many times have you had false positives ?

I had a urine test taken I know I'm clean but it came showed a positive reading so I was told I didn't see it. I would think its standard for 2 people from the office to make a accurate decision to be sent to the lab. I read the reviews on PrPremier Biotech and all ere bad basically saying how they destroy peoples lifes.I have spent a lot of money with my treatment program I would hate to think that being this close to the end its a ploy to make fake positive results just to get more money.