Police say the driver of a car that barreled through a building used for a popular after-school camp in central Illinois, killing three children and a teenager, may have had a medical emergency.

Days after a rooftop gunman killed seven people at a parade, attention has turned to how the assailant obtained multiple guns and whether the laws on Illinois books could have prevented the Independence Day massacre.

CNN A Dunkin' employee was arrested Friday after an Illinois State Trooper discovered mucus in his drink. Vincent J. Sessler, 25, was charged with disorderly conduct, reckless conduct and battery to a peace officer, according to Illinois State Police. The men and women of the Illinois State Police put their heart and soul into protecting the lives and rights of all people in this state every day," ISP Director Brendan F. Kelly said in a statement. Immediately after the incident, the issue was investigated and Sessler was terminated from his job, a Dunkin' spokesperson told CNN. "Dunkin' has a deep appreciation for police officers who work tirelessly to keep our communities safe, and the franchise owner has reached out directly to the officer to apologize for the experience."