Western Flyer Express – They sent me to drug tests every week

I have worked for the company Western Flyer Express within 10 years and there was a big problem. The managers told me to go for the drug test every week. I was a good driver and have done all assignments on time. I still couldn’t get what they want to prove or find out. All my tests were good and I haven’t used any drugs. But I was tired of different checks and tests. None from the employees has these tests as often as I did.