Need some answers! Able to detect piss doesnt belong to this person? More Complicated

OK so im getting a drug test done next week and I know its a urine test, but.......


They also test my blood for cholesterol and stuff and just to see how my body is doing. Im substituting my piss, so I wanted to know if its ok if my blood is from me and the piss is from my clean friend. Will they be able to tell?

** The blood is not used to test for drugs, only the urine/piss is**

i will be in a similar situation. im assuming your fine. also u myte have to pee twice...once for the drug test and once for the physical part. so make sure u sub the right one.