Twin brothers, Merlin and Marlon Uli, have been found guilty in American Samoa of unlawful possession of methamphetamine and marijuana following a four-day trial.
After deliberating for three hours, the six-member jury found each brother guilty of two counts of unlawful possession of controlled substances.
The conviction has been hailed as a major victory for the government in its fight against drugs.
The defendants in their late 20's have long been suspected by authorities as being part of a major drug dealing operation.
The pair will be sentenced in January.
American Samoa's mandatory drug laws provide a sentence of 5-10 years for possession with no possibility for probation or parole.