Drug law enforcement aims to reduce the consumption of illicit drugs t
hrough reducing supply and increasing prices. Data on cocaine and hero
in seizures, prices, and methods of trafficking are presented for 1983
-93. Seizures, giving some indirect indicator of trafficking, rose sha
rply for both drugs in the second half of the the 1980s. Prices of bot
h drugs showed a decline across the decade, and the prices of both dru
gs seemed to track each other. Data on the primary, means of transport
of cocaine and heroin into Europe lends support to an explanation of
the price patterns in terms of the risk factors these impose for traff
ickers. The nature of the trafficking, and the mechanism by which enfo
rcement of trafficking laws is intended to impact upon the problem, su
ggest that the rapid substitution of interdicted traffickers and route
s is highly likely, and that present levels of enforcement will have l
ittle deterrent or preventive impact. While the European drug scene is
changing rapidly, not least due to political changes, the analysis ma
y retain some general applicability.