PartyNextDoor tried to bring his pharmaceutical fun from Canada to the United States.

But the border patrol wasn't having it.

U.S. Customs and Border officials stopped Party's tour bus after it crossed the Lewiston-Queenston Bridge into Niagara County, New York yesterday.

The agents found Xanax and Oxycodone on PND and Xans on his buddy Jerome Nevins. New York State Troopers were then called in to make arrests.

Party and Nevis were both charged with Seventh-Degree Criminal Possession of a Controlled Substance and issued appearance tickets returnable in the Town of Lewiston Court.

Party is scheduled to play TD Garden in Boston, Massachusetts tonight as part Halsey's Hopeless Fountain Kingdom tour.

So far no word from PND's camp on the arrest, but he is expected to make the show.

[Related: PartyNextDoor calls out culture vulture.]