The availability of sodium pentobarbital (Nembutal) in powdered form from China by mail order has prompted many who have received the drug to question the purity of the drug received in the mail. If the powder is pure, 10gm dissolved in water will proved a peaceful, and reliable death if drunk. To reassure those making such a purchase Exit International has developed a quantitative test that allows people, in the privacy of their own home, to establish whether the white powder is Nembutal AND that it has a purity of better than 95% (ie to ensure that the powder received has not been diluted -or cut -by some contaminant). Many samples from a number of sources (listed on page 210 of The Peaceful Pill eHandbook) have been tested using gas chromatography and the trial version of the test kit. To date NO significant contamination has been detected in any of the samples received.