Réponse:
1-The most popular fictional detective are not professionals, they are amateur sleuths.
2-If the police do not have sufficient proof they must try and get a confession.
3-Newspaper often publish gruesome stories, but they seem to appeal to their readers.
4-when a case is solved the culprit or culprits are arrested.
5-Detectives do not only use material evidence to solve a case, they also use their intelligence and psychology.