One of his trainees subsequently detonated a device on a local golf course, and videotaped the blast for later approval by Pieski. The teacher is reported to have described the explosion as “cool”. A month later, police were called to a house near the golf course after an acid bomb alert. One youngster at the scene told officers that “Pieski showed students in class how to make the explosive device”. His mother added that he had told her the bomb was a school chemistry project.