Meaning of the word "an old poacher makes the best gamekeeper" in English

What does "an old poacher makes the best gamekeeper" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

an old poacher makes the best gamekeeper

US /æn oʊld ˈpoʊ.tʃər meɪks ðə best ˈɡeɪmˌkiː.pər/
UK /ən əʊld ˈpəʊ.tʃə meɪks ðə best ˈɡeɪmˌkiː.pə/
"an old poacher makes the best gamekeeper" picture

Idiom

someone who has experience in doing something wrong or illegal is the best person to prevent others from doing the same

Example:
The bank hired a former hacker to lead their cybersecurity team; after all, an old poacher makes the best gamekeeper.
He was a rebel in his youth, but now he's a strict principal; an old poacher makes the best gamekeeper.