“The final issue for HB 18 is that the law fails to define key categories of prohibited topics, including ‘grooming,’ ‘harassment,’ and ‘substance abuse,’” Pitman wrote in his ruling. “At what point, for example, does alcohol use become ‘substance abuse?’ When does an extreme diet cross the line into an ‘eating disorder?’ What defines ‘grooming’ and ‘harassment?’ Under these indefinite meanings, it is easy to see how an attorney general could arbitrarily discriminate in his enforcement of the law.”