My name is James Woodlock and I am a CIA agent. My colleagues and I have worked on a special case for about three years and our most recent investigations and discoveries show that a person you can see every day may be a member of the FSB (the principal security agency of Russia) responsible for the death of an American diplomat (Adam X).

Before I continue, please let me make it clear: first, we do need your help and second, that person is certainly really dangerous!

The person we would like to get information about is named Monsieur Dufour who, as far as we know, works as your school librarian.

Here is what we know and what we would like you to do:

Monsieur Dufour is always away from the school library from 10 am to 11 am, so you could go there at that time to try and find clues and other information about him.

Besides, I can tell that Adam X was shot in the head and that his hat was missing when we found his body. We think that Monsieur Dufour took it. Perhaps you will find it somewhere in the school library, and  possibly in his desk. Indeed, some information about the school librarian's habits was found by a French agent who was working on this mission with us. Agent Dumont (who was also found dead in his apartment last week) discovered that Monsieur Dufour usually keeps documents in his desk. The problem is that its drawer is padlocked, so you will have to find a way to open. The Padlet document (which contains everything we know about Monsieur Dufour) will probably help you on this mission, especially to open the padlock.

Good luck my young and brave friends!
J. W.

Une mallette portative est à votre disposition. A l’intérieur, vous avez les consignes et le matériel scientifique nécessaire pour analyser l’ADN extrait des traces de sang. 

Un bac de gel agarose soumis à un circuit électrique, un appareil miniaturisé d’amplification et de découpage de l’ADN, paires de pince, des gants, blouses, des blocs réfrigérants, des tubes d’échantillonnage. 

Consignes : - visionner le lien suivant : https://www.youtube.com/watch?v=jc_zYQvEQeU et déterminer comment cet indice peut « parler » ! 

1- procéder à l’analyse de l’ADN du sang trouvé sur la chemise. 

2- comparer avec le profil ADN du sang trouvé sur la scène du crime. 

Résultats trouvés : voir photo ci-dessous

3 – quelle conclusion pouvez –vous formuler ?