You are thinking of a police detective, I think. I am speaking of private detectives. Like Holmes.

But there is no school or class that can make someone a true detective. Detective is something you become through experience and observation. We're students of human nature, using logic to see through the tricks that criminals play on human minds. After all, to the right mind any crime is only another puzzle.

But if you had to be specific about it, I suppose you would call me an elementary school detective.

[Because no one would believe me to be a high school detective, looking as I do now.]