Welcome to the voice of America’s News Words.In September,officials removed all weapons from the police force in the Mexican town of Acapulco.Infiltrate.Two top police officials are accused of murder and the entire force is under investigation.Authorities say drug criminals infiltrated the police force in order to control them.To infiltrate is to enter or join a group or organization secretly to get information or do harm.It also means to pass through something.For example,water can easily infiltrate the soil.

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