At Baltimore/Washington BWI airport, as at every airport in the United States, passengers arriving on an international flight must clear immigration (CBP) and customs, collect their checked bags and re-check them, and go through TSA security again before their connecting flight, even when both flights are on the same ticket.
The airport has 5 terminals or concourses (Concourse A, Concourse B, Concourse C, Concourse D, Concourse E).
Connecting passengers go through a transfer security screening.