Who Dunnit ?

Who Dunnit?    

In room 4 we are solving a crime that happen in the class room. We found the window was broken and someone has broken in the class room and there was blood on the window. 


Using CCTV footage we now have four suspects. 

 When we discovered our blood under the microscope, we were able to extract enough to do a blood typing test. We found that the blood was A+

We also tested the victims blood to check that it wasn't their blood at the scene, but they were O-.



We then tested our suspects blood. 1 was AB+. 2 was B-, 3 was A+,4 was O+. From this we knew it had to be suspect A.