The Coastie that became case law was arrested in Orange County NY. Guy didn't have creds, license suspended, was traveling with wanted criminals and was still cleared.
YMMV
From Wiki:
A number of other courts have held that Coast Guard boarding officers are qualified under LEOSA. In People against Benjamin L. Booth, Jr., Indictment No. 2007-940 (2007), a county court in Orange County, New York, dismissed a criminal charge against Booth, an off-duty member of the Coast Guard, who had been arrested for carrying a loaded handgun in a vehicle. The court held that Booth was authorized to carry a firearm while acting as a Coast Guard boarding officer, adding, "Although the proof at the hearing indicates that the defendant engaged in a violation of rules, regulations and policies of the United States Coast Guard by possessing a handgun for which he had no license, these violations do not act to lessen the scope of LEOSA as it is applied in this instance."