This paper contrasts the American TC model with that of the United Kingdom,
presents an overview and history from 1965 to the present of Therapeutic C
ommunity (TC) treatment as applied in the United States particularly to dru
g using, offenders, and it details findings from five scientifically sound
studies that this kind of treatment during custody for incarcerated drug us
ing offenders is effective in reducing drug abuse and recidivism. A final s
ection presents the therapeutic principles derived from North American TC r
esearch and practice conducive to altering addict-offender lifestyles and i
mproving the likelihood of a positive outcome.