In most cases, a law enforcement agency does not want a person to know they are the subject of a criminal investigation. This is because the agencies assume that if they tell the person they are being watched, they will stop whatever activity it is that they are doing. This would make it impossible for law enforcement to catch them.
White collar crimes are different. If you are suspected of committing a white collar crime, you will be contacted by the agency. They may serve you with a subpoena for documents. They may take you in and question you. Sometimes you will be subpoenaed to testify in front of the grand jury. You may also receive a target letter from the federal prosecutor advising you that you are the target of a white collar investigation.
Posted in: White Collar Crimes