Here is the latest Iowa news from The Associated Press at 3:00 a.m. CDT

GRIMES, Iowa (AP) — An autopsy shows a 2-year-old boy found dead in his Polk County home died of a drug overdose. The Polk County sheriff’s office announced Monday an autopsy by the county medical examiner’s office determined Mason Wyckoff died of acute Oxycodone toxicity. The death was ruled a homicide. The medical examiner’s office also found the child’s mother, Stephanie Erickson, died of Oxycodone toxicity. Her death was ruled a suicide.

WATERLOO, Iowa (AP) — A white officer has admitted to making “crass” remarks about a black teenager who was the victim of a fatal 2013 shooting in Iowa. Waterloo Police Chief Daniel Trelka says he has opened an internal investigation into the remarks by the officer, who was caught on tape disparaging 18-year-old Dae’Quan Campbell. The remarks were first reported by the Waterloo-Cedar Falls Courier.

CEDAR RAPIDS, Iowa (AP) — Virginia Sen. Tim Kaine will make his first visit to Iowa since becoming the Democratic vice presidential nominee. Kaine will hold what’s being called an “organizing event” at 11 a.m. Wednesday at Kirkwood Community College in Cedar Rapids. Kaine’s event will continue a flurry of visits to Iowa by both presidential campaigns in recent weeks.

DES MOINES, Iowa (AP) — A flag desecration charge has been dropped for a man who protested a crude oil pipeline that crosses his property by hanging an American flag upside down at his home, online court records show. Homer Martz had been charged Friday under a state law that makes it illegal to defile, cast contempt upon, satirize or deride a flag. The charge was dropped Monday.