I'm no expert, but from what I've been reading lately I decided to put my money on QuickFix 5.7.
I got mine in the mail yesterday and being that it can be re-heated several times, and easily concealed, I feel more confident with it than dilution. Plus The passing rate looks to be 100%.

I've never been monitored at Labcor b4 so I;m not sure if they do.