Interview with Daniel Couffaine

Liam: Do you remember you solved the case of Stiles Bennet? 
Daniel: Yes. He suicide in his house. 
Liam: Why do you think he suicide? It could be a murder too. 
Daniel: Kids his age usually commit suicide due to stress. Also he cut himself. We found his DNA on the weapon.
Liam: But the weapon could be anything. What if someone changed the weapon or used his DNA?
Daniel: No. It was the only weapon we found. Also we investigated it further. We found out he was always lonely and had no friends. 
Liam: What about the scratches and bruises on his hands?
Daniel: He must have fallen somewhere. Or hurt something. 
Liam: It could also mean that he tried to defend himself. Daniel: Do you want to ask anything more? I am busy. 
Liam: Did you know he was getting bullied? 
Daniel: Yes. So it also meant that he was tired and wanted to take away his life.
Liam: Did you know it was your brother who bullied him? 
Daniel: [a long pause] Yes. I know it. 
Liam: Did you stop investigating it because your brother was a suspect?
Daniel: No. I don't mix my personal life with my profession. 
Liam: Did you also know that was found in his body? 
Daniel: Yes. We know it. 
Liam: So why didn't you do anything? 
Daniel: It's just a drug. Kids his age take drugs. It's not a big deal. 
Liam: That's all.