Lupo and Bernard investigate a traffic accident that results in the death of several people. The driver of a minivan chauffeuring several children including her own started acting oddly and drove down the wrong way on an major roadway causing the accident. The autopsy reveals she had alcohol in her system but everyone who knew her swears up and down that she rarely drank. Further testing reveals that she had a prescription drug in her system that had been put in her allergy nasal spray. When they look into it further, they realize that the driver worked for the company that manufactured the drug found in her system. Someone at the company clearly spiked her nasal spray.
—garykmcd