Forensic Science Class Solves a Crime

Here's the scene: murder on the beach, detectives arrive and are presented with 6 suspects,  all of whom have an alibi.  All of the physical evidence has been corrupted so they have to rely on interview techniques alone. The 6 suspects are grilled by the investigators and it turns out that two are lying!  Did the Forensic Science class get their man (woman)?  Well , it turns out they did.  Ms. Ganitsky's class was successfully able to  determine that Ms. Brown and Mr. MacDonald were not being truthful and were involved in the murder after putting the skills they had learned in class into play.