"implicate each other" is a correct and usable phrase in written English.
It means that two or more things or people are involved or connected in a way that suggests they are responsible for something. Example: The two suspects both had alibis, but their stories implicated each other, making it difficult for the police to determine who was lying.
He said there were another 1,190 killings under investigation, but they were probably due to drug gangs murdering people who could implicate each other.
Through the course of the civil war, the Syrian government and the rebel opposition have proved adept at manipulating social media to implicate each other in atrocities, trading accusations that cannot be substantiated.
Thus it is not just that things implicate each other but that things include each other.
Yet, such a move is as problematic because the two concepts mutually implicate each other and neither one has an original priority.
Detectives said Mr. Taylor and Mr. Godineaux made statements implicating each other in the crimes.
The case is being heard by two separate juries because Mr. Phoenix and Mr. Scott have implicated each other in the beatings.
Some of them have implicated each other, according to the Post, and the one they blame the most is Staff Sergeant Calvin R. Gibbs, who allegedly got his fellow soldiers talking about putting together a "kill team" after he joined the unit late last year.
The accused men implicated each other in interviews, but prosecutors did not share that information with Tracy -- essentially leading her to believe her case was weaker than it really was.
It is a story of two criminals, held separately and each given the same choices: If one implicates his partner and the other does not, the betrayer goes free and the silent one gets three years; if each implicates the other, each gets two years, and if both are silent, they each serve only a single year.
