Saliva collection

Dr Dave Smart 100307.2661 at
Fri Aug 30 03:27:41 EST 1996

I have seen an advert somewhere for saliva collection devices 
but can't remember where.
I am interested in doing some research on saliva.
Could anyone tell me
1: Why a collection device?  Why not (to put it crudely) just 
spit into a tube?

2: Where I can get saliva collection devices (once convinced I 
need them).

Many thanks
Dr Dave Smart

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