For those who don't want to hit Google, the conviction was for possessing 30g of a synthetic opioid "U-47700". A normal dose is ~1mg, 10mg can be deadly (so this was 30000 trips or killing 3000).
The drug became illegal across the US on November 14, 2016.
"Police said they found the drug in Thorpe’s apartment in Manchester in December 2016" (https://apnews.com/general-news-d68dca63e95946fbb9cc82f38540...)
"Preston Thorpe, age 25, was sentenced by the Hillsborough County Superior Court (Northern District) to 15 to 30 years stand committed in the New Hampshire State Prison for possession of the controlled drug 3,4-dicholo-N-[2-(dimethylamino)-cyclohexyl]-N-methylbenzamide (also known as "U-47700") with the intent to distribute. U-47700 is a synthetic opioid that is classified as a Schedule I drug." (https://www.doj.nh.gov/news-and-media/preston-thorpe-sentenc...)