A Cross Plains teen is likely headed to federal prison after pleading guilty Tuesday in U.S. District Court to taking part in a sophisticated, large-scale marijuana growing operation. Zachary A. Czerkas, 19, said in court that he had taken a job with his co-defendant, Curtis J. Faustich, to earn money for school and help him move out of the home of his mother and step-father. Until his arrest on April 13, Faustich, 23, had been a horticulture major at UW-Madison.