They evacuated their homes Tuesday night, but officials said they could return Wednesday. Substances used to make methamphetamine can be volatile, officials said. Mike Whalen of Waterloo Fire Rescue said an ambulance and crew were called as a precaution during the cleanup. Neighbors said they did not detect an odor, which officials said can be a signal for methamphetamine manufacturing. Waterloo police Sgt.
Recent reports say meth use has increased in Iowa.
Several weeks ago Sen. Charles Grassley had a town meeting in Waterloo to discuss the drug's appearance in this area. We have suspected there were meth labs in the area. Staff Writer Nathan Phelps contributed to this article.