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Drug Testing News
Ecstasy testing kits
prove unreliable
16:25 25 February 03
NewScientist.com news service
Ecstasy testing kits, used by clubbers to screen out dud pills
are unreliable, according to a "blind" test of pills with
known ingredients.
Testing kits based on reagents that change colour in the
presence of chemicals in the ecstasy family are available
around the world, mainly via the internet. They typically
consist of one to three small chemical bottles and are
designed to be portable, so that the user can carry out a test
in the toilet of a nightclub for example.
The kits, which can test up to 150 pills, do not claim to
measure the dosage or purity of a pill, but simply the
presence or absence of MDMA - the chemical name for ecstasy -
or very similar compounds. Clubbers use them to screen out
pills that are likely to contain other, potentially more
dangerous, substances. PMA, for example, is sometimes sold as
ecstasy but has been associated with several deaths in the US,
Europe and Australia.
The experiments revealing the unreliability of the tests were
carried out by Rebecca Murray and colleagues at the University
of Florida in Gainesville. "This is going to create a false
sense of security," she told New Scientist. Murray believes
the kits performed badly because the colour charts provided do
not match well with the colours actually observed. Also,
assessing the changes is very subjective and especially
challenging if lighting conditions vary.
Better than nothing
"We'll be the first to admit that ecstasy testing kits are not
terribly accurate," says Ian Baker, of DanceSafe, the San
Francisco charity that supplied the test kits. "The
instructions for the kit very explicitly state its
limitations."
But while ecstasy remains illegal, he says, a fallible test is
better than no test at all. "We try very hard to avoid giving
users a false sense of security." The group sell a few hundred
kits a month in the US.
Murray's team gave eight pills each to two testers who had
never used the kits before. The experiments were "blind" - the
researchers knew what was in the pills but the testers did
not. Two of the tablets contained MDMA, while the rest were
composed of other compounds sometimes found in pills such as
ketamine, morphine, caffeine and d-norpropoxyphene.
The first tester rated seven of the pills, including both the
MDMA tablets, as not containing the drug, the researchers told
the American Academy of Forensic Sciences conference in
Chicago last week. The one pill the tester believed had tested
positive in fact contained morphine.
Pushing purity
In contrast, the second tester thought six samples contained
MDMA, rating the ketamine and d-norpropoxyphene tablets as
negative. One of the testers, University of Florida
toxicologist Bruce Goldberger, says: "I failed miserably."
However, testing kits have had a noticeable effect on pill
purity, says Matthew Atha, director of the Independent Drug
Monitoring Unit, based in Wigan, UK. "The number of duds has
dropped," he says.
Amsterdam based company EZ Test were the first to start
marketing the kits and have sold about 300,000 tests worldwide
in the past six years. "There are no 'good' pills," says Ewoud
Vijfwinkel of EZ Test. "All we can give is an indication as to
what is inside, that's a lot more reliable than a dealer's
word on quality."