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>> When you have a suspect package and you want
to sample it for particles, you always want to sample the areas
where the package was sealed because this would have come
into contact with the handlers hands.
So we found that a good way of sampling the closures are
by doing a swirl pattern with the swab that corresponds
to your trace explosive detector.
So you introduce it into the instrument
and press the trigger.
Okay, and we detected explosives and the compound is RDXHMX.
Now this box was prepared by someone
who had contaminated hands with the particles provided
by NIST -- their standard reference material 2905
and these are the florescent particles that contained C4
which RDX and HMX or TNT and we describe these
within our lectures in this workshop.