Using anothers urine for a drug test?

I have a drug test coming up on Monday at my doctors & I'm definitely going to fail my test. However, he uses these cheap dip cup tests that show the results instantly. This doctor drugs tests all most all his patients, literally has a drawer full of them. I asked my girlfriend to help me out but I don't know if this will work so I'm asking here as I'm sure some of you have used someone else urine for a drug test. I've never faked a drug test before so I have no clue about any of this.

I have this small plastic bottle, I can use her clean urine for the test, the bottle should be big enough to fill the line above the cup. I was just going to just strap it to my thigh some how. They never watch you while you go, I have the whole bathroom to myself, they don't give a sh*t.

Would this work? Can I have her do it like a half hour before my appointment and just take it in with me? Any tips on what I can use to keep it warm or is it strapping it my thigh good enough or something like those HotHands Hand Warmers? Any chance of the doctor knowing it's not mine by looking at the results.

I feel a douche even asking help on this but I really need to pass next week. Thanks guys :)
 
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