A southern Arizona man has been sentenced to 15 years in federal prison after pleading guilty in Tucson in a drug trafficking case.

Forty-year-old Robert J. Piehl was indicted last August after authorities found nearly three and a-half tons of marijuana stored at his home in Arivaca.

Prosecutors said the pot was found under the floor boards of his home and in a trailer on his property.

Piehl, according to court records, had a prior felony conviction in Ohio for possession of marijuana.