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1. no
2. no, not if it is completly clean urine
NEVER mix dirty urine with a clean sample, human or synthetic. A reading of GC/MS 150 ng/mL is a common as dirt and a 1-10 ratio would make a clean sample fail with a 15ng/mL count.
If given a choice, ALWAYS substitute a clean sample.
Last, triple X is simply expencive $$$ dilution. Read the dilution guidelines linked to in my signature and save most of the $$$ for what you really want to spend it on.
:!)
N2
PS I have used QF many time and it simply works.
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