re: Why was the FBI and DHS involved with Pentagon to seize the Venezuelan tanker today?

Uncharted territory?

Why Ships Are Seized
-Sanctions Violations: Preventing oil or goods transfer for sanctioned nations (Iran, Venezuela) or groups.
-Illicit Trafficking: Stopping arms smuggling or other illegal activities.
-Wartime Actions: Capturing enemy vessels or assets.

Here is two other ones and you can find a lot more.


In March and April 2007, the U.S. Coast Guard made a record-setting seizure of approximately 38,000 to 43,000 pounds of cocaine from a single ship, the Panamanian-flagged motor vessel Gatun, off the coast of Panama. This was part of a major anti-drug operation. Included DEA and DHS in this operations

LINK

The 2020 Iranian tanker seizure refers to the U.S. Department of Justice's largest-ever confiscation of Iranian fuel (1.1 million barrels) from four tankers—Bella, Bering, Pandi, Luna—headed to Venezuela in August 2020, disrupting an IRGC operation. This followed by just a day an incident where Iranian forces briefly seized the tanker Wila in the Gulf of Oman, reportedly searching for that same seized cargo, highlighting escalating tensions and a tit-for-tat in maritime seizures between Iran and the U.S. over sanction evasion.

LINK