46 U.S.C. § 30908

Exemption from arrest or seizure

The following are not subject to arrest or seizure by judicial process in the United States:

(1)

A vessel owned by, possessed by, or operated by or for the United States or a federally-owned corporation.

(2)

Cargo owned or possessed by the United States or a federally-owned corporation.

( Pub. L. 109–304, § 6(c) , Oct. 6, 2006 , 120 Stat. 1518 .)