Witness tampering is a criminal offense that occurs when someone tries to influence, intimidate, or coerce a witness to change their testimony or not testify at all. This can involve threats, bribery, or other forms of manipulation aimed at altering the witness's account of events in a legal case. The act of witness tampering undermines the integrity of the judicial system, as it can lead to false testimonies and wrongful convictions. Law enforcement agencies, such as the FBI, actively investigate and prosecute cases of witness tampering to ensure that justice is served and that witnesses can provide truthful accounts without fear.