Can a urine test check the levels of opiates in my system?

I have to test for court every week and they know I am taking them. They want me to give a count everyday. I didn't know if they can check my levels to see if it matches what my count is.

: http://alcoholdrugstreatment.info/can-a-urine-test-check-the-levels-of-opiates-in-my-system