An Evansville man will stand trial in July for making homemade explosive devices. The Evansville "Courier & Press" reports Franz Corvette Costello faces charges of making explosive devices and drug-related offenses. Police searched his home on March 19th after being tipped-off that he was making bombs and had threatened to kill a police officer. Police found homemade grenades packed with screws and other items. His trial is scheduled for July 21st.