"Reasonable indication" to open DOJ investigation. Pretty low standard.

The standard of "reasonable indication" is substantially lower than probable cause. In determining whether there is reasonable indication of a federal criminal violation, a Special Agent may take into account any facts or circumstances that a prudent investigator would consider. However, the standard does require specific facts or circumstances indicating a past, current, or impending violation. There must be an objective, factual basis for initiating the investigation; a mere hunch is insufficient.

https://www.justice.gov/archives/ag/attorney-generals-guidelines-general-crimes-racketeering-enterprise-and-domestic#investigations