When Severide and Seagar are looking for arson equipment, Severide handles a padlock and then the screwdriver with which he snaps it, both without wearing gloves, this contaminating an active crime scene.
Trained professional firefighters and paramedics allow Kidd to get into her vehicle and drive away, even though she is clearly exhausted. Seconds later, she crashes into another vehicle. In reality, the professionals would use their training to prevent Kidd from driving, as drowsy driving is in fact just as dangerous as drunk driving.