Piss test thru Labcorp...weighing my best options

Background information:
I've been an avid smoker for years. I usually smoke two-three times a day and for the most part its' always been a higher quality. I weigh roughly 170-175 pounds.

Previously I have tried the Detox drinks and have had success and failure with em. Most recently, I failed an initial test through a hiring agency. I hadn't smoked in two days before the test and I had taken two doses of XXXClean. (I took an "at home" drug test and failed initially with one bottle of XXXClean. After failing, I went to a local head shop and bought another bottle of XXXClean. My "at home" tests were still showing "negative" but I could only faintly see the "negative" line.) They sent my urine to Labcorp and luckily was within the range of error to pass (<15NG).

With that being said, I don't want to have a repeat to what happened earlier. Therefore, I'm wondering what would be the best route to go for my upcoming drug test. I'm not sure if someone will be watching me pee because the new drug test being issued is through a new HR department (the business I work for was bought out by another company).

The way I see it, I have three different options:

1) Take a detox product (I'll be a full 3 days clean when I do)
2) Use Magnum synthetic urine (I already bought it before coming here)
3) Use a friends urine (who obviously is clean)

If I decide to go with option 1)..what are the best detox's I can find to ensure that I won't be positive on a piss test?
If I choose option 2) what are the chances Labcorp or another lab can identify that the urine sample I give them is infact human? Also, what are the best procedures to ensure the temperature is within the required range for testing?
Option 3) is similar to option 2)...my main concern is ensuring the urine sample stays within the correct temperature range and the urine doesn't "go bad"

Option 2 will be your most reliable way to pass.
If you're in Amerika you will not be observed for a pre employement drug test.
Be sure to practice with the synthetic, or use water, to make sure you keep the temp around 98 degrees.

I am here sweating the results of my LabCorp test from yesterday. I used a synthetic and the substitution was laugh all the way to the bank easy, however I've been reading on some sites that LabCorp tests for synthetic. I don't know if it's true or not. Their web site says that "specimen validity testing (SVT)" is "available" but it doesn't say that they do it with every test.

Labcorp does not normally test for synthetics unless the company is willing to pay the extra costs. And for DOT type tests that can not test for synthetics.