The Green Bay Police Department received an envelope on Monday, and the contents cause a secretary and police captain to become dizzy and lightheaded. As a precaution, the pair was administered Narcan, and transported to a local hospital. The envelope in question was overnighted to the station, and the chief noticed it was odd right away. The FBI is assisting in the investigation, and will run tests on the envelope to figure out what the substance was. The Green Bay Police Department is attempting to locate the sender.