( KTRS ) The Missouri Supreme Court has upheld the conviction of a southwest Missouri man who told police he had considered committing a mass shooting at a Wal-Mart or a movie theater.

Police interviewed Lammers after his mother warned them that he had purchased two assault rifles and she was worried he wasn’t taking his depression medicine. Lammers told police he had thought about shooting up a Wal-Mart after watching a movie about the Columbine High School shootings, but changed his mind because he didn’t want to go to prison.

The court says that Lammers’ gun purchases, the time he spent practice shooting and his statements are sufficient to uphold his attempted first-degree assault and armed criminal action convictions.