Examples:

• Each and every one of the victims was a professional bad apple.
• I'm sure, but that doesn't mean that a bad apple won't slip through from time to time.
• You know, we can't let one bad apple ruin your work.
• Well, look, there's a bad apple in every barrel, right?
• Yeah, that's sad, but at the end Josie was just a bad apple.
• Time will tell if it was one bad apple spoiling the rest.
• I mean, just cause I'm a bad apple.
• Pretty much is the bad apple of the family.
• And one bad apple can spoil everything.
• So... so, what, you think he's a bad apple?