Here's why:
* Implicated is a verb, meaning "to show to be involved in something, especially a crime or other wrong act."
* Implication is the noun form of "implicated," referring to the act of implicating someone or the state of being implicated. It can also refer to a suggestion or inference.
Examples:
* Verb: The witness implicated the suspect in the robbery.
* Noun: The witness's testimony had serious implications for the case.