Police believe the woman had taken drugs, alcohol or both.
Results from a blood test were not expected for a week. Her son, Stephen, was listed in critical condition with broken bones at a West Palm Beach hospital. Witnesses told police they saw Haddad late Thursday morning speeding up to 90 mph along Interstate 95, the main north-south artery on Florida's Atlantic coast. She crossed the grassy median into southbound traffic, then zipped back toward the northbound lanes, witnesses said. At least three people reported seeing the woman throw the toddler through the driver's side window, according to the arrest affidavit.