GBL testing/detecting: important questions

[amor999]

Some questions that are very important for SWIM.
Imagine that SWIM was found with a liquid that
is suspected to be GBL, in a country where this
is not allowed.

1) How difficult is to detect that that liquid is
really GBL? (SWIM read that GBL detection is not
easy). It seems that a simple lab was not able
to check it, and it seems that the liquid was
sent to a larger lab inside a famous college.
However, time is passing and results are not coming
in: what does it mean? Aren't they able to test it?
What should SWIM think of what is happening?

2) Provided they are able to detect GBL, would this
be a simple test Yes/No, or can they find how much
GBL (%) is inside the liquid?

3) Provided they are able to detect GBL, are they
able to detect that it is exactly such substance?
I mean: can they distinguish it from GHB? Or is the
result the same for both substances?
(Imagine GBL compared to GHB+water, for example).
If the result is the same for GBL and GHB (non
distinguishable), is the same for other substances also?
(Including non-scheduled substances?)

4) Provided that they can distinguish GBL from GHB,
can they also distinguish NaGHB from GHB?
Or KGHB from GHB?

Thanks
amor999