David Hausman, a New York City antiques dealer, was sentenced to 6 months in prison for illegally purchasing rhinoceros horns. The federal court also hit Hausman with a $28,000 fine for breaking laws intended to protect endangered black rhinos.

Hausman was arrested and pleaded guilty in court last summer, admitting that he knew the horns needed to be more than 100 years old in order to be purchased legally. Hausman, whose arrest was part of a nationwide crackdown, had previously offered to help the U.S. Fish & Wildlife Service fight the illegal sales of rhinoceros horn.

Rhinoceros horn carvings, which are believed to bring good luck and health, have left the world’s rhino population devastated.