I'm assuming (and, I'm not sure, so don't quote me) that if you tested in the US, that the US batch would be correct.
(apparently Canadian Testing is a tad more stringent?)
I'd heard from many sources that the detox drinks do not work.
Something throws the test out of whack, or, you're required to drink copious amounts of water, and your test comes up 'diluted'...often an automatic fail.
I couldn't find accurate information as to whether testing for synthetics is done in Canada, if anywhere, and that's why we went with the 'real thing'...hehe.
I have heard wonderful things about quick fix in the US though - from many sources, both online, and off.
Hope it goes well for you...Good Luck
Jj