John Jones boards a Greyhound bus leaving California for the Bronx. The bus stops, as it is required to do, at the permanent Border Patrol checkpoint in Sierra Roja, Texas. Border Patrol Agent Wontdo boards the bus to check immigration status. He passes through the bus and, as he's walking back down the aisle, he squeezes a dark green gym bag which has something in it that feels like a "brick-like" object. The bag belongs to Jones, who consents to opening the bag. Wontdo discovers a brick of Peruvian gold crack cocaine. Wontdo, arrests Jones. Please discuss the constitutionality of the search. Please define terms you use in the discussion.