Saliva tests were then carried on the women and their babies when the infants were a year old.

BBC: NEWS | Health | Babies inherit 9/11 mums' stress

The LifePoint saliva test is cheaper and much faster than drug tests sent to laboratories, including those for saliva.

FORBES: LifePoint Makes New, Portable Drug Test

Confusing the picture further are private labs that offer tests of stool or saliva that they say can definitively diagnose gluten sensitivity.

WSJ: New Guide to Who Really Shouldn't Eat Gluten

In February DNA tests on two roe deer discovered dead in Gloucestershire found only saliva relating to foxes.

BBC: Essex lion: Charting the big cats of Britain