Detectives are only human; we're not Gods that know everything. When detectives tell their theory, in reality, most are rather anxious. Thinking that there's always possibility that they could have missed something, somewhere... But in return, the excitement you experience when your theory's smack bang correct is twice as great!

A secret makes a woman woman - Vermouth

Everything is real, except Beika City

A detective who uses his deductive powers to corner a suspect and then does nothing to stop them from committing suicide is no better than a murderer himself. - Kudo Shinichi

You must never forget it if that's an important memory to you. Especially when a person dies, he can only live in the memories of others.

Flowers are fragile and ephemeral...Even if you meant to protect them with a surrounding fence from wind and rain, they would die without sunlight...and a spindly fence has no power against a strong wind. - Haibara Ai

With a keen eye for details, one truth prevails!