Case Study:

The manager of the college food services promised the Chancellor of the college a plate of hisfavorite chocolate chip cookies for the upcoming meeting with the executive council of theBoard of Directors. The chocolate chip cookies, a specialty of Chef Rojo's, are famous across thecollege campus. The day before the board meeting, Chef Rojo checked the pantries in the mainkitchen and discovered that he only had one bag of the special chocolate chips left he needed forhis cookies. He placed all of the ingredients onto the lower shelf of the pantry so that he wouldbe ready to bake the cookies first thing the next morning.

Chef Rojo locked the pantry, turned off the kitchen lights and left for the night. When hereturned the next morning, he was greeted with a horrific sight. The door to the kitchen had beenpried open, and the metal door on the pantry was bent and torn where someone had pried thelock of the pantry door. The ingredients for the cookies were scattered around the kitchen. Thebags of sugar and flour were busted on the floor. The open and empty bag of chocolate chips layon the kitchen counter along with a glass that had lipstick marks on it and a note printed in blackmarker. The thief had cut his or her hand on the pantry door and left blood stains.

Chef Rojo immediately called the campus authorities to report the tragedy. The criminal justice,genetics and chemistry lab instructors were all then called to the crime scene. The investigatorsinterviewed a group of students who had returned home late from an outing and said that theyhad seen two professors walking back near the dining hall at 2:00 am. The professors werewalking toward the dining hall. One of the professors, Dr. Chandler Bing in history, sat on the

executive council as the faculty representative to the board and would have known about thechocolate chip cookies for the meeting.

Interestingly, both Dr. Bing and the other professor, Dr. Arya Stark in Language Arts, each had ahand bandaged when they were interviewed. The genetics lab instructor confiscated the blackmarkers that were on each professor's desk for further analysis. Each professor also gave buccalswab sample for DNA analysis.

The following things were set up for the reaction by using the DNA samples from the suspectsand the crime scene:

Reaction Tube #Crime scene sample Hinc II digest 1Crime scene sample Xmn I digest 2Crime scene sample HincII/XmnI digest 3Suspect 1 sample Hinc II digest 4Suspect 1 sample XmnI digest 5Suspect 1 sample Hinc II/XmnI digest 6Suspect 2 sample Hinc II digest 7Suspect 2 sample XmnI digest 8Suspect 2 sample Hinc II/XmnI digest 9