Will cannabis matter in a urine test?

I was accused of being imparied and the officer gave me a field sobriety test and make me follow his finger looking directly at the sun. Sent me to jail where the subject me to a "blood test" read a middle aged man stabbing me in the arm repeatly after they couldn't draw blook I was subjected to a urine test which I took. I was not imparied in any way but I am a mild cannibas user and that will appear in the urine sample can I fight this?